WBJEE 2026 Chemistry Ans Key and Detailed Solution | FREE PDF+ Analysis | WBJEE Paper Solution

Added: 2026-05-25

[00:00:01]Okay so hello everyone I think you can hear me so what are we going to do today in DUBJ 2026 that means those of you who have come with a paper in DUBJ 2026 or upcoming ones who will give DUBJ in 2027 or 28 will get a very big learning from this paper. Okay mostly this lecture or mostly session we will actually tell the students of DUBJ 2026 to actually attend because that is important for you. Okay let's start.

[00:00:30]You don't have to match how many marks you get. Well in this session here, what is my expected answer, we will do more or less problems which you will see with accuracy. Some questions may have errors, I will tell you or some questions may have errors, so I have told you in advance in case of minor errors. Obviously, no one mind that thing because we have come to give you the video with two solutions. Okay, maybe we made a mistake in the question. Okay, first, what is it that first says you have Keto3 acetone and what does it say that there is phenol? You can see that phenol means what happened? The phenol is coming to your product in the initial product. Okay, the phenol is coming to your initial product and then it reacts with Ketch again and gets V. It tells me that first of all, you think for yourself that K2CO3 acetone is K2CO3 acetone.

[00:01:16]When you have K2CO3 acetone, what do you think?

[00:01:18]Look again. There is also this. That means what should happen to you.

[00:01:20]This BR will leave here and where will this BR go and attack? Will the beer go somewhere and attack? Look, it is attacking here. So this option is this option. I am getting it so far.

[00:01:29]Till now, okay, next, since there is phenol, we have Ket to phenol. Again, there is a beer. So what is this beer? It will go out of here but from here it will go here it will go here it needs so much hydrogen [clearing throat] Where will you get hydrogen from? Hydrogen will take hydrogen from H.

[00:01:43]It will be minus here. It will be minus here. Look, this compound is done. So I was able to explain option D correctly. Surely it was easy. Look, let's go to the next question. The one among them is not C.F.T. A2.I3.Plus.Specifically having linear structure. Which one is linear structure? In the meantime, think about it a little.

[00:02:09]N2. I have also drawn the structure.

[00:02:12]Well, students get confused between N.T. and A2.

[00:02:13]This is the N.T. structure and A2.

[00:02:16]You have to keep in mind that A2 becomes our bend shape.

[00:02:20]A2 will never be linear. And I3. These are not linear. Okay, A2 and I3 plus and here where here where where A2 is. We will eliminate the options. That means which one of us will survive.

[00:02:31]This one will survive. So this is our original option. Okay, you can also do the structure. If you want, we will do the question in the following reaction. What is the N product? The N product is asking me. Look, you have a ketone. First, initially, PCL5 is attached to benzene at 100 degrees Celsius. Okay, that means what will happen here? Then, from here, there is A2, which we have in the present reaction, Birch reduction. You may have read a little bit about that. Okay, what will happen here? This A2, this reagent that you see here, A2, is very important because it has been used three to four times in your paper. It breaks your double bond and tries to create an anion at the carbon head. Okay, so diborination is happening. Bit6. You understand that when diboration occurs, your water is H+. O minus OK which one should be according to option C Okay let's go next Compound Xtended Thi This is inorganic mystery consent is very easy I taught a lot of tricks that time what will happen if you react with CuF and K present and what is it that is white color we took a session of inorganic chemistry where we discussed all the colors of inorganic chemistry in this year's batch so definitely those who have studied can do it and is it brown color you asked me what did you ask me on adding X Compound X is asking Actually OK Next Engine Heat What is the formula of the engine This should have been a physics question because what was the formula of the engine N Equal minus Titbitiota look constant 300 degree centigrade sorry degree centigrade constant so my tito is getting heavy It also means that the minus sign is fixed, so my tit is getting heavy.

[00:04:27]If my tit is heavy, you think for yourself when the value of this n will be higher and when the value of this total term will be lower because if you subtract a small thing from one, obviously its value will be much larger and if you subtract something larger than one, its value will decrease. That means what should the value of my tit be? Should it be higher or lower? It is in the numerator.

[00:04:44]Look, it should be lower. Where is the lower? 20 degree option. I have been able to understand this. Surely, the thing is easy. Okay, next. The conductance experiment is an example of a 3- solution molar solution. One question to keep in mind is that first, until the equilibrium is reached, it will be linear.

[00:05:09]Then, the graph will go upwards at a point. Means option D next indicates the major product of the following reaction. Is there a 3 or 3 here? Says major product you can clearly see what will happen here SNT reaction can happen so N2 reaction if there is polar protic solvent then NNT reaction will happen NNT reaction if it happens here that means what will happen here BRB and will go out Bir will also go out Dotm here only hydrogen will be there so a double bond will be formed here you can see option next Vant of factor is asking NNT F4 is very easy NNT F4 what will actually happen A plus Eft minus we can break it initially what is one then then zero zero then 1 minus alpha alpha means our decreasing value will be R2 alpha and alpha why did I write two alpha because there were two so that's why two alpha so what will be the total mole what was the formula of Vant factor total mole or initial total mole what will be the addition of all these things after adding all these things which That will come after doing all these things that we have total mole and divided or initial which was one so if you divide you will get plus alpha so even though you get plus what will happen to your saucer plus afa next sulfuric acid pyro sulfuric acid says very very very easy so what will you do pyro sulfuric acid that means what you have to have SOS linkage here can you see which structure has SS linkage can you see which structure does not have SS leakage that means only option D so option D next peroxide peroxide what does ot minus look like you all know and ot minus is 18 and we already taught in shortcut 16 and odd what are all these paramagnetic and the rest which are even numbers 18 20 or 16 sorry what are all these? Diamagnetic will be diamagnetic. Next, how many isomers can a compound of molecular formula S3A5B be made of? It's very simple. What will you do? Due Degree of Uncuration will be barred. What was the Degree of Uncuration Formula? Carbon plus one minus H plus X divided by. And if there were n, it would be plus n but. That is no longer there. So that won't happen.

[00:07:13]So carbon plus one. So how much carbon is there here? There are three, two plus one. And how much hydrogen is there?

[00:07:19]Five o'clock. How much bromine is there? Halogen one.

[00:07:21]So by applying this formula you will get one.

[00:07:22]Why did I reveal this formula to you?

[00:07:24]Through this formula we will be able to know what should happen.

[00:07:26]If this formula means that the formula is not equal to zero, what does that mean? Here we understand that by simplifying, we will understand that we will have some kind of double bond or ring formation here.

[00:07:38]What does Degree of Unsaturation mean? Number of double bonds or number of ring formations. So if you build the structure well, you can make a single three-membered ring. That means you will have a three-member ring. And you do n't make the double bonds neat, you get four more, okay, plus one will be five, actually, okay, next, which one of the following compounds gives chocolate brown precipitate, it's an aqueous solution, very easy, if copper two plus reacts with F Ca, then what will happen, F Ca, it's just a brown color, actually it's not a chocolate color, it's a brown color, okay, you can't say that all chocolate is brown.

[00:08:17]That's why we don't say chocolate color, it could be that the question is a misprint or that the examiner who created the question made it in such a way that it is called chocolate color.

[00:08:25]Oh, this is a very easy question. What is it saying? Where is this? This corner. So how much is it in the corner? How much does it cost at the Buy ER Center?

[00:08:33]A cube doesn't have just one center.

[00:08:34]How much will that mean? AB ratio that means A EB Okay, next question. This is our one-time mock test question. You can see. If I show you our mock test questions, our Bong Study mock test chemistry papers that I have prepared and also the lectures that I have taken in our live sessions or you can say full length year long batch, they are so relevant that those who have given the paper can say how many marks they can score. It has been a very, very easy paper for them respectively. I mean if they follow my lectures well and follow the materials that I have given a little far, they will also get 40 plus marks in this chemistry paper easily. I can say it is easy because I have taught the concepts of that level. Those who have read it can also say in the comments. Obviously, the students of our batch will know more. Okay, what is next?

[00:09:20]It is cutting at a place and cutting at two places. So what should be the radial not n minus l minus one equals two? So now the value of l Look at how much it says for P, what will be the value of L? We all know the value of S, what will be the value of P for L, what will be the value of P, what will be the value of D, what will be the value of F, what will be the value of three, we know that the value of L for S PDF N my my one equals two, what will be N minus O minus one equals N, what will be F, what will be F, next is a buffer solution content, buffer solution question, simple formula, what is the pk log salt or acid salt, what was salt, you can multiply 0.0 and if you do that, what will you get, you will get one here, and if you multiply this, what will be 200 and 0 misf, you will get 0 from here, you will get four.

[00:10:11]So what should I do, obviously? Which one is salt? Salt is what we see. CH3 CO is not called salt, is it? There are acids and bases, both reacting together. So I won't call him Salt. So, salt by base.

[00:10:22]Salt is acid, not base. Because it's not called a base.

[00:10:25]This is a wick base. We don't all know.

[00:10:28]So what should I do? P.I.P. Log Salt or Acid. So if you calculate, you will get 5.34. Okay, what are you asking me next?

[00:10:39]Conducting conductivity simple I will look at the charge whose charge is the highest you can clearly see here if you multiply your oxidation number it will be plus five it will be your plus f it will be plus two it will be plus th that means which one is the most five a most options at means options where are the most dot means options d next borax borax borage inorganic inorganic benzene we already discussed the top question is there and our lecture also discussed well well ok inorganic benzene and benzene are two different many may not know inorganic benzene with a6 it is a single borane diborane and a3 reacts with ammonia ok next increasing order of basicity of following compound basicity for basicity do I need to look where is it stabilizing easily or stabilizing Her chances are high. You think for yourself what it will do here. It will give the ring and it will be able to participate in resonance. [sniffing] Look here too. It will give it here too. It will give it here. It can resonate in both directions. That means more stability. It is a little less stable. And it will not be stable at all because it will not be able to resonate in any way.

[00:11:44]So what should it really be?

[00:11:47]Then the next option is to call it bar reduction. I did not want to talk about it.

[00:11:53]Barth reduction. I have told you many times.

[00:11:55]Barth reduction is very, very important. Okay, there are 3. Barth reduction is simple. If you create X, what will happen? Simple. You and X. This is the question of our lecture.

[00:12:05]Then what is there? If we react with B and PTO N, what will happen? A bond will be formed that will be BR BR. Okay, so option B next is our Vanderwaal equation. What is a very simple equation? P plus N squared B squared V minus Nb equals N RT so the value of N is you check and see if you check N value you will clearly see if N value is also checked and it is not a real gas or an ideal gas what was the equation of real gas what was the equation of Piri idea gas what was the equation of Pbt and for real gas there was no wonder so real gas many people can make this mistake ideal gas not ideal it will be real gas ok ok what is the next one saying which of the following does not loose water even even in concentration simple thing you think about it which is very stable or you can say which easily means stability is very low which will only try to break it will only try to break it if it breaks it it will not automatically go aromatic or antiaromatic because we all know aromatic stability is highest then antiaemic then Non-aromatic then antiaromatic nos look at this option two look at what you have this is yours this is yours aromatic if aromatic is sorry antiaromatic is very unstable miss will not react in any way ok really option will be broken next major product in fong reaction can this be reaction what reaction mechanism n ok well then what will happen simple is there then simple nothing will happen. It will replace NO2. Then go here and attack. So, NO2 will go and attack this one too.

[00:13:42]Option B Option D. Next color is the following in non-ionic order. What does the anion order say about the sulfur and oxygen?

[00:13:49]Sulfur will come first. We already read here. So, sulfur comes first. What should happen then?

[00:13:56]One second.

[00:13:58]So what should be done first? What should happen then? Why One? Because oxygen.

[00:14:01]Then he will come to the last because there is absolute resonance.

[00:14:03]So three reasons why if it resonates why should it react with others easily it wo n't it EP3 edit that means there should be six bond pairs plus lone pairs together there should be six you check the first option X F S X means eight out of eight six is ​​gone here still two left two means two electrons means it will make a lone pair dot means seven is becoming seven means will it never happen EP3 edit never happen SPD3 will be that means it will happen to us here it says not well this is a very important question already we discussed the lecture was there a similar type of question we had a graph of equilibrium. I don't know if you remember I Think.

[00:14:36]The graph was like this. So obviously after this point, our equilibrium starts. So you can see that option three here says that indicate equivalence is the correct one. Okay? Next.

[00:14:48]Next is a very easy question. 400 ml is first.

[00:14:50]Then it says it's going to be 50M.

[00:14:54]What is the half-life or N number of cycles? So what do we get out of it?

[00:14:56]Since the first order reaction alone is not enough, what is the power? What will happen if the totu gets power? 400 or 500 because our after condensation was 50 and how much was the initial 400 is 8 then what is the power of 8 then what will be the value of n will be 3 will be simple then what formula will we apply a 8 8 this is for our first order we already have 200 questions where we solved them we have taught all these again what do we actually do here we will get the value of k from here half then what is asking me what is asking me I will halve nb if you calculate for first order reaction you will get 2.77 77 myf next what is saying next look again similar how does a2 a2 actually do full acidic protonation because it creates anion then what is there Linder catalyst how does Linder catalyst do reduction reduction means if there is a triple bond then double It will convert to a bond, so the original option A will not happen, and the rest of the options may happen, but think for yourself, there are already 12 carbons here, so where are the 12 carbons and a structure has been created by hydrogen and the original option B is a cyclic structure. Well, then what is question number 68? What was our lambda formula?

[00:16:02]Lambd eq H or root overt MK.

[00:16:05]We all know the formula for degrees, so we will just put all the values and we don't need to do anything. If we put the values, we will get something like 896. So I was saying this question wrong. It is a color question because why color question? Because 850 is given here and my number was 896. So there is a lot of deflection. So if you do the near about option, I think you will be correct. Next, calculate magnetic moment.

[00:16:28]What is happening to me? Magnetic moment.

[00:16:29]To find out magnetic moment, I need to What should we do? We have to multiply the number of unpaired electrons because what was the formula? Sorry, the number of unpaired electrons is a plus in the magnetic moment. We all know the formula. What should we do?

[00:16:39]Before we put the formula, what should we do? We will multiply the oxidation number by X plus minus O. Why did I minus one because look, there is a minus in the head. And why did I minus one in the total?

[00:16:47]Because the equation was minus. So, what is the real X plus X? If it is plus, what is it?

[00:16:53]44? What is our RU? I hit 4. So, what did we do? I also wrote the electronic configuration. Then what did we do? I added U. That means that the electrons will go from our five Ss and the other two Ds will remain. Dot means diff.

[00:17:05]diff. It means that you will see something like this since EDT dot means strong field ligand. So what should we do?

[00:17:11]After pairing it, one unpaired electron will remain.

[00:17:12]Having one unpaired electron left means that the formula is What will happen to EO Plus because I did not say N is the number of unpaired electrons, how many NEX is it? The formula for NEX is very simple.

[00:17:25]What does it say in the question glucose is added to 1 L? Well, mass and volume are the same. You will accept mass and volume here.

[00:17:30]What was the formula for delta TF? I am to K in F. Well, what was the value of delta TF or KF? Look, that means 0.00. So what is the value of IEM? 0.00.

[00:17:40]Well, now how do I get the value of A or if I do not know the value of A, what will I do now? I will accept one.

[00:17:46]Simple. Okay, what will I do with M? What is molality?

[00:17:48]Molality? Number of moles of solute divided by weight of solvent? I will put all those things in.

[00:17:54]Well, after putting them in, my NB value will come out.

[00:17:56]What will I do after NB comes in? What happens to DBA, M and M? How much is M? How much is your water? For example, multiply the number by 180. It says water or glucose.

[00:18:08]For glucose, multiply by 180 and you get 99 something. So it would definitely be option D. Next we will move on to Category Two. Let's move on to the first question in Category Two.

[00:18:17]I'd say it was a good question.

[00:18:19]So will you do the reaction first?

[00:18:22]What form will this give me? It's a plus A2, plus A2, give it to your plus.

[00:18:30]Okay, now we need to decide on the limiting reagent here.

[00:18:31]When you go to decide the limiting reagent, you first have to use the data that is given.

[00:18:35]Iodine is given. And we know how many molecular months it has.

[00:18:39]0.05 will act as a limiting reason, so what will be the month of water? 0.005 is 0.7. Okay, now what is it telling me? It is asking me what percentage was it, I mean, the percentage of the miss.

[00:18:51]Initial means final div or initial in. So how much is final? 07 is the initial? How much is 34s? Okay, the next question is wrong. This question may be wrong, but what does the question say about the initial average or how much is the miss?

[00:19:14]What will happen to it? It means after some time [music]?

[00:19:29]What will happen to me? I have to find out. I have put it in. See what I have written. M or N or look. So the service will go up. So it is NT or There must be something wrong here, I don't know, but that's what was happening to me. What is the coordination number? It's a very simple question. Coordination number is six. Very good.

[00:19:47]Then you can subtract the oxidation number from here because we already know how to subtract. We have learned a lot of time.

[00:19:54]I have put the oxidation number here. Look, when we subtract the oxidation number, the plus will come from 27 to plus. This electronic configuration will stand.

[00:20:03]What should we do with it? Let's write it like this again. It will actually stand as a total electronic configuration. Are there any unpaired electrons in the total electronic configuration?

[00:20:09]Because H3 is a strong field ligand. So what will happen, obviously? Will pair up. So there will be no electrons. So option A is asking for next XW. Look again, what is the need for A2 A2 here? Yes, it is necessary. Why?

[00:20:21]Because protonation has to be done or a complete anion has to be formed. So if we make an anion, what will happen to X? First, A2 will need to be confirmed.

[00:20:28]What does this take? Then you think about it yourself. All the halides are on both sides here. But who is the most? Good living group. Iodine, you can apply iodine, so which option should be option B?

[00:20:40]Next Upack name is very very easy question, absolutely lecture question. What will you do?

[00:20:45]How will you start naming? What will be the name? One to three. What will be the name? One chloro. The alphabetical order is chloro. Fluoro.

[00:20:53]Nitro. What will come first? M is first. Then there is T. What will come first? Chloro. Methyl.

[00:20:59]Then what will be the name. Two nitro. Then benzene.

[00:21:02]Since benzene is written. Okay, now we will go to category three. The first question you see in category three is: Whose structure is this? The first question in Category Three is: Whose structure is it?

[00:21:11]You say this is not the structure of Diggory? So can the degenerate structure degenerate form ring isomerism? Obviously can't? Because tautomerism doesn't show. Okay, that'll do.

[00:21:21]What do you give? Osazone with phenyl hydrogen. Obviously not.

[00:21:25]We already read from the biomolecular chapter that phenyl hydrogen reacts with oxygen.

[00:21:29]What is Next? Gives this iso this is ste isomerism.

[00:21:33]I have a little doubt that this option will not be isothermal, it should be 16, but since if it says total, then it will be 16, and if it says actual, I want to mean that how many will be in Hadi or El individually, then it will be done at this point, so I have a little doubt, so I marked it as letter law update, okay, it responded to Tollens, why is it because there is no LD, what does Simple Nex say, isobaric, isothermal, well, you think for yourself, first, there is no need to read anything, the question is, isothermal, adiabatic, what is PV, eq, and for adiabatic, what is PBI, KBA, power, what is asking me in the first option, work right by the gas, you think for yourself, what is the gamma value, gamma value is yours, which is one for isothermal, but if it is adiabatic, then some value will be greater than one, that means As the denominator increases, the work done will decrease, so the work done by the gas in process A will be absolutely greater than that of B because what you had in B was adiabatic, what was below the gamma value? If gamma was greater than one, then it would be OK.

[00:22:38]Next, the final temperature of process B is less than obviously less than that because delta Q is equal to N CB delta. Don't worry about it yourself. There was a formula for Q Q. If you apply the formula, delta does not mean the change in temperature is zero. But what happened? Since it was an adiabatic process, heat loss was zero. But there will be some other losses, so there will be some temperature drop.

[00:22:56]Change in internal energy is absolutely zero.

[00:23:00]What is the formula for N CB delta or N B delta?

[00:23:03]If delta is zero, then the reason is that In the isothermal process, it will be zero and in option B, it will not be zero. That is, in process B, because what was there originally, there was work done and we read the formula for work done for isothermal. For the isothermal, the next heat or gas is positive for the idebatic process, but zero in process B, obviously for the first one, it will be positive because what is delta E?

[00:23:28]We all know what is NCB delta or what was DLT. So in our previous case, the internal energy was Zr, but what was our first? Due Eq. DQ plus DDB. So if we have Due Zr, what will happen to DQ? Along with this, what will happen to DQ minus DQ? So, what will happen to DQ? This is what we know for process two or we are now dealing with process one. If we deal with process one, what will happen to our Due Zr?

[00:23:59]What will happen then? There is a positive meaning right AB CD all of these and correct next which of the following is correct Starch is composting repeating alpha glucose originally Starch has alpha glucose okay Nylon six is ​​an addition polymer or not I have already said many times in the lecture chilly chilly addition polymer is not condensation isopene monobar of unit natural originally isopene natural rubber is2 okay Bakelite is obtained from reaction with phenol not reaction the formaldehyde plus cetaldehyde I said all aldehydes are there no phenoton there okay next which of the following have tetradal structure tetradal structure what should be obviously my SP3 should not DSP we understand so the option which will be DSP is mine You will see that in the first option, when you do not show the electronic configuration, after showing the oxidation number, you will see that your option will not be there in any way.

[00:24:51]In this option, your D will be blank and the strong field was getting sweet, that is why it was blank. That means that AP3 is not possible in any way. And you will see that all the other options are going this way and that means option B C D is the correct one A is the wrong one Next is Boyles' law. I have been reading since childhood. Is P V a ​​constant? What does this graph look like? Rectangular hyperbola. We all know that the graph of P and V is an even rectangular hyperbola. But we have to remember that if we arrange it a little, PV is equal to PV. Then we can take the log of both sides. We completely convert it to this side by taking the log. So AP is now negative. So, look at log P and log V. What was the negative slope in the graph that means this is also a correct option. Okay, let's see what was in the option. If pB = k, then p = what will be k/V and y = mx, then if y = mx, it will be a straight line.

[00:25:34]Option A is also correct. Okay, I think you understand. We have done the solutions of all the papers of Dobbies 2026. So, some questions may be wrong. You can also mention them already. Okay, we are correct because we have come to give you the video as soon as possible in a short time. That's all for today. See you in the next video. Until then, take care.