STEREOCHEMISTRY Technical questions and answers Live Class Pharmjoe tutors

Added: 2026-05-12

[00:00:00]Can I write the next question?

[00:00:05]>> Yes. Thank you. I love the person that wrote this um equation.

[00:00:10]Who is this person? Katy CH3. I love it.

[00:00:13]Can somebody write out the formula for me? Yes. Yes. Write out the chemical formula. CH3. What will be the chemical formula?

[00:00:22]The chemical formula of this. They said this exam. Exo is six. 1 2 3 4 5 6. This is exact.

[00:00:34]Now exag is in what position? Position number one. So this can be your position number one and this can be position number one.

[00:00:45]So let's say I use this as position number one. which I said since this is position 1 2 3 so what's on three let's see what's on four 1 2 3 4 four will be what br is on four then is on what five you can put it anywhere up or down so let's put our hydrogen Now take a look at this question everybody. How many can this one be a stereo genenic center? Can this now this cannot be a stereogenic center because of what? Because of hydrogen and what irogen. So this cannot be a stereogenic center. This also cannot be a stereogenic center. Why? Because of hydrogen and what hydrogen.

[00:01:43]Now can this one be a stereogenic center? Yes. Why the of this is different I mean different from this different from this and different from this right I mean different from this different from this and different from this so this is the center one now can this also be a center yes why because this is different different from this different from the whole of you and that's center that's one this and that two and then yeah can can also be a center Yes. So because this is different this and this and this and this and that means it's three. So we have three ky center.

[00:02:25]Our k center is three. So we have three ky center which you got three center. So how do you get your number of reason you say 2 to the power of what? N and our n is equivalent to what? 3. So that's 2^ 3 will give us what? 8. So the answer is eight stereo stereo ice.

[00:02:51]Thank you. Now let's move to the next question.

[00:02:55]Let's move to the next question. I think that is clear.

[00:03:01]We can move to the next question. The next question I'm going to clean this one off now for those who are coming late. Sorry. Let me help you move here for a while.

[00:03:11]H I want to put another question on the board.

[00:03:16]Another question.

[00:03:19]That question should be online.

[00:03:27]What will be the answer to this question?

[00:03:36]I told you we are not going to take time. Some people thought Everybody, let's take a look at this question together.

[00:04:05]Let's take a look at this question together.

[00:04:12]Two bromo two bromo pentan 2 4 di that's the next compound number of ky center.

[00:04:44]Then number of stereo isomers.

[00:04:55]Four. Three. Draw the chemical structure.

[00:05:04]Oh yeah yeah yeah. We have limited time.

[00:05:11]Who saying it is block? It is not. Which one is block?

[00:05:19]It's not block. Which one is block? Can you see it now?

[00:05:29]If you tired of house, come come back to campus. Some people are on campus in case you do not know.

[00:05:36]Not >> what I offender. If I knock you, if I knock you, >> Joseph, >> I ask you, Joseph, I ask you to go to I send the video to you today. Did you Did you work on the video? Did you check the video?

[00:05:55]I miss you. Okay. Thank you.

[00:06:06]Rufus Elijah I don't know K sent out.

[00:06:08]Did you check the video I sent to the group today? I said everybody should check that video. The video is on my YouTube channel. I gave you a video to check and I asked you that I'm going to be giving you question today. So anybody that don't understand how to get the kra center we mean that the person did not check the video I sent. The video is on my YouTube channel on Kyra Center.

[00:06:39]Sorry, I'll give you don't worry.

[00:06:51]I don't check and cause I don't get data but you have data that you just said I'm waiting for you how many k center and can somebody write out the structure everybody write out the structure of this thing let me write out the structure I want to see the structure for some of you.

[00:07:34]I like that girl.

[00:07:38]Where are you?

[00:07:52]I'm waiting for everybody to drop your answer. Drop your answer.

[00:07:57]Some people did not know the answer.

[00:07:59]Copy answer.

[00:08:01]This is what you will do for me after the class. I want you to all the question I'm giving you. You you you write it in your notes.

[00:08:11]Then you snap it. After snapping it, you're going to put it under the comment section of this video by the time I finish recording because some of you are not doing it. I know what you are doing.

[00:08:22]You are copying people's answer.

[00:08:26]So if you are to draw this, what's the meaning of this? They said two broan 2 diode means that it contains two O. So pentan the word pentan means it is five carbon. So 1 2 3 4 5 pent pent pentan.

[00:08:46]So d means it has two O and one O is equation number two. The other one is equation number what? Four. So I can say 1 2. So I can put my O here. So 1 2 3 4 then O is here because one O is equation number two. Another one is equation number four. That's why we calling it then I said two bromo pent two bromo one two bromo is equation number two bromo so we have H here we have H here we have H here we have H here we have H here we have H here now if you are on this group and you did not check the formal video the video I dropped on the on the YouTube channel today please go and check it to understand kyra center now can this carbon be a chyro carbon no why Hydrogen hydrogen hydrogen this cannot be a higher carbon. Can this be a carbon? Yes. One is different from O is different from B is different from all these. So this is one one. Can this be a Kra? No. Can this be a Kra? Yes.

[00:09:52]This is two.

[00:09:53]>> Yes.

[00:09:54]>> So how many Ky center we have? This can be a this can be a because this is different from different from this different from this. So this is a this.

[00:10:02]So how many ky center?

[00:10:04]>> We have two.

[00:10:07]We have two K center.

[00:10:10]We have two K centers.

[00:10:15]So what will be the number of stabiliz which is 2 power number of center is two that will be four. The answer is four.

[00:10:32]I told you that we're not going to take too much time today. We've already spent um 25 minutes on the group. So, we are moving now. I want to clean off this one and put another question there.

[00:10:58]Yeah.

[00:11:00]I want it to be simple. That's why I thought you know so that it will be simple.

[00:11:08]Can I clean this for those who are can I clean it up?

[00:11:13]Who is this person that is shouting my name who is to me? I don't know.

[00:11:17]Tofi no money to me.

[00:11:24]I know her.

[00:11:29]Now another question for us.

[00:11:44]I have another question for us now.

[00:11:52]Nice.

[00:12:01]Nice.

[00:12:32]I'm beautifying it so that it can be so beautiful.

[00:12:55]I need How many ky center do we have in this compound?

[00:13:00]How many kyra center do we have in this compound?

[00:13:07]>> You they build house a minimum build the house on a straight line. Okay.

[00:13:14]I don't want cyclic anything. Mary goat we meet where is tofumi I don't know tofumi who is tofumi who knows to me in what department to me now let's look at this compound how many car center is in that compound She's in B. Okay. I do not know her.

[00:13:53]We'll meet when we resume. The way she's shouting my name, she come and give me money. Now look at that compound. What will be the answer?

[00:14:06]How many kyra center?

[00:14:10]How many kyra center?

[00:14:22]And how many ky center? Then after that you get the number of stereo isomearism.

[00:14:31]How many?

[00:14:36]I'm seeing four. Some people said four.

[00:14:38]Some people said one. Some people said one. That makes one.

[00:14:44]Some people Please tap on the like button. Tap tap tap tap double tap.

[00:14:50]What's who is or who said what center? Oh, you did not check the video I dropped today.

[00:14:58]I dropped a video on my YouTube channel.

[00:15:03]Why didn't you check the Oh, I ask you to check the video. Please after this class, do well to check the video on Kyra center or is that clear? I gave them the video to check today and we said we are going to be solving question. Is that okay? So, some of you did not check the video. For those who are yet to check the video, there's a video on the YouTube channel about Kyra Center.

[00:15:32]Tofu Messi one Kaira center.

[00:15:36]Rufos Elijah four Kaira center.

[00:15:40]Khadijat one Kai Jetim 2 Kai center 255 one K center testimony one Kai center offender Joseph 4 Kai center.

[00:15:59]Mommy mommy mommy. Mommy one ka center.

[00:16:04]Angela one kyra center and just you need to know is here one k center two one or four cannot be a student. What is the meaning of one or four? Will you pick one or four in your exam or two or five tomato center one car center sebast one car center one car center so who will get the answer what's the answer to that question how many k center oh yeah let's can I go on with the correction now can I do the correction 100. Okay, now Lord, you're going back.

[00:17:08]You have exhausted your data. Let me on my spot for this. My data has finished.

[00:17:15]Mod data has finished.

[00:17:25]Still working. Still working.

[00:17:28]Oh yeah.

[00:17:30]Let me on spot for you please.

[00:17:36]Fio for me. Oh yeah. Let's let's go back to now this cannot be a ky center because of hydrogen and hydrogen. Now this cannot be a ky center. Some of you don't know the reason why this carbon cannot be a ky center. Who can tell me why this carbon cannot be a ky center? I will solve for you.

[00:17:53]I don't know. I'm not sorry for you. How why this carbon cannot be a center.

[00:18:02]>> Thank you. Somebody said double bond.

[00:18:04]Anytime you have a double bond, it is sp2. Your ky center must not have a double bond. It must be single bond all around it. So meaning that this guy cannot be a car center because of the double bond that is there. This carbon two is having one two. But because of the double bond it cannot be a ky center. So anywhere you see double bond the carbon cannot be a ky center. This carbon this carbon is also having a double bond cannot be a ky center. This carbon is having a double bond cannot be a ky center.

[00:18:36]This one is ch.

[00:18:39]This one cannot be a ky center also. So which one exactly can be a kio center.

[00:18:44]Look at this guy here. This guy is having O. He's having H. He's having the O of this and he's having these making how many making 1 2 3 4 around this carbon that is here. So how many center do we have? One. So the answer is one center. So Joseph go and watch that video Joseph. Don't let me fight you. that 2^ the answer the current center is one 2 um that one position just okay that 2^ 2 is So I have two more question before we stop the class.

[00:19:44]The live we started new cuz I noticed that I have two more question before we we we stop our question.

[00:20:00]>> Okay. Thank you. Let me like and subscribe.

[00:20:04]Like and subscribe. I say like and subscribe.

[00:20:08]I did say.

[00:20:14]Now I want to move to questions around I want to ask somebody a question.

[00:20:22]Yeah, I want to ask somebody a question if you can remember.

[00:20:26]You can remember the question.

[00:20:31]What is the criteria for a compound to be optically active?

[00:20:38]30 minutes don't never reach 1 hour now.

[00:20:41]Who is this mommy? Mommy mommy.

[00:20:47]Oh yeah. What's I want to eat roasted corn. What's the criteria for a compound to be optically active?

[00:21:01]It has a centeron.

[00:21:07]It must have a ky center. Who can tell me again? What's the criteria for a compound to be optically active? Number one, it must have a ky center. Yes. What other thing?

[00:21:17]>> It must have the ability. Who is I'll give you something. It must have the ability to rotate a polarized light.

[00:21:25]Thank you. Some of you did not watch that video gone.

[00:21:31]Ability to rotate a plane of a polarized light. Thank you. Now, if the plane of a polarized light is rotated to the left, what do we call it?

[00:21:43]Okay, I'm about to finish. Just give me 10 minutes more. We'll stop the class.

[00:21:49]If it has the ability to rotate the plane of polarized light to the right, to the left, to the left. If it rotates to the left, what will you call it?

[00:21:58]Level rotator and call rotator.

[00:22:04]Yes.

[00:22:05]Thank you. Tap on the like button. Tap tap tap tap tap. Then if you tap the ability to rotate it to the right, what will you call it?

[00:22:19]Somebody is not tapping. Tap.

[00:22:28]Now then I want us to go to sis and trans.

[00:22:36]Sis and trans.

[00:22:40]Under my video I explain sis and trans to you.

[00:22:50]So I have question for you.

[00:22:54]I want you to answer this question which Okay, let me first ask if you have this.

[00:23:19]>> Is this going to be cis or trans?

[00:23:25]Is this going to be sis or trans?

[00:23:28]Joshua, it's not trans like you want to be in the dream. Trans. Not trans. This one is dream. Is trans.

[00:23:42]Okay. Now, do you remember the rule? Who can tell me the compounds that have the ability to undergo season trans?

[00:23:56]Who can tell me the Jesus who said transgender me now the company that have the ability to under go and trans who can tell me alen and cylo thank you you people are too much is alen the answer is aline and cycl is cycl.

[00:24:40]Can you see cycllo alaine?

[00:24:45]Alkins and cycllo alaine. Thank you so much. Thank you. You people are following your Lawrence. Mommy. Who is that mommy? What's what is your name apart from mommy?

[00:24:55]Are you a mommy?

[00:24:57]Now our king and cylo are okay. But do you know that it's not all our king that can undergo a cis and trans isome.

[00:25:12]Now I want to bring this up and give you a question.

[00:25:24]Which of the following?

[00:25:32]Which of the following are kings would not exhibit geometric?

[00:25:48]Isome boots to material boots to in boots.

[00:26:16]Roman one. Roman figure 2, Roma figure 3 one in.

[00:26:25]And lastly, one bromo boots one in question. Out of these guys, mention the guys here that will not exhibit a geometric isomeism. Mention the guys that will not exhibit sis and trans. It will not exhibit sis and trans.

[00:26:56]Give me the guys that will not exhibit cis and trans.

[00:27:02]Which of the following our king would not exhibit geometric isomeism? That means the s and trans. That will be our question.

[00:27:15]That will be at 110 MB exhausted. But let me reload.

[00:27:20]I'll buy data for you.

[00:27:25]Now everybody should write this down as assignment so that we can end the class quickly. I want to show you something.

[00:27:30]Everybody write this down as assignments. Oh yeah. Screenshot.

[00:27:33]Screenshot. Screenshot shall come.

[00:27:38]Screenshot and do it as assignments.

[00:27:44]Have you done that? I want to show you something real quick.

[00:27:48]I want to show you something real quick.

[00:27:50]Now do you people remember that there's something we call you know I told you that I want them to like this >> I know I said I or cycl I know what are okay.

[00:28:24]Have somebody written that as assignments? Okay.

[00:28:30]Write everything down. Since you've written everything down, I'll clean it off now. Is that clear?

[00:28:38]Can I clean the board?

[00:28:45]Okay, I want to ask a question.

[00:28:54]What type of isolation is these guys and these guys exhibiting? See these two compound. What type of isomeism are they exhibiting?

[00:29:28]What type of isomearism is these two compound exhibiting?

[00:29:33]The first one and the second one. What type of is itism are they exhibiting?

[00:29:37]Who said optical?

[00:29:41]>> They can under optical medicine. Yes, I know the reason why he said that they can under but I'm saying that the two of them like this. What type of v is medicine are they exhibiting? Position.

[00:29:53]Position. Positional. Why do you say positional?

[00:29:57]You notice that this one is in position number two. Why this one is in position?

[00:30:03]One. No, one. I told you when you move this one is question number two. This is 1 2 3 4. This is two chloro butane and this one is one chloro butane.

[00:30:21]So two chlorobutane and one chlorobutane. What type of why positional? Positional have to do with the position of the substituent. Now So, somebody said, "Why can't this be um optical?"

[00:30:45]Yes, there's a car center on each of them. I know. Can you see? There's a car center on each of them. I know, but that's not what I'm asking. The question is between this one, this guy and this guy, what are they exhibiting? The only difference between these two guys is the position of the chlorine. That is why I call it a a positional isomeism. Is that clear?

[00:31:08]Thank you so much. Thank you so much.

[00:31:11]Positional isomeism.

[00:31:14]One of these guys.

[00:31:17]I'm almost done.

[00:31:19]What about this guy?

[00:31:41]A and B. Now everybody look at A and B are the isoma. First question I want to ask that question. Are they isomer of each other this compound compound A and compound B are the isomer of each other?

[00:32:07]How can you check that for me? Who can check that for me?

[00:32:12]>> For example, let's count this one. How many carbon is there? 1 2 3 4 F four carbon C4. How many hydrogen do we have there? 2 + 1 3 A 4 5 C 7 8 hydrogen is what? Eight. C4 H8. Abby. The carbon here is four. The hydrogen there is eight. Now let's go to this guy.

[00:32:38]Let's see what we can do. This guy is having carbon. Carbon carbon carbon which is hydrogen. Hydrogen hydrogen hydrogen hydrogen hydrogen hydrogen and hydrogen. If you count the number of carbon that's how many C4 1 2 3 4 C4 How many hydrogen do they have there? 1 2 3 4 5 6 7 8 H8 C4 H8 C4 H8 They have the same molecular formula. But do they bear the same name? No, they don't bear the same name. Who can tell me the name of the first one? Give me the name of the first one everybody.

[00:33:16]>> Thank you. Give me the name of the first one everybody. Name of the first structure. A everybody online. I'm waiting know what's the name of the first structure compound? A cyclutane. Thank you. This one is is not this is cycl butane.

[00:33:41]Now the compound down. Give me the name of the compound that is down. Compound B. Give me the name of compound B.

[00:33:54]Compound B. Name of compound B. I'm waiting for everybody. Name of compound B. Bin A. This is 1 2 3 for boot. But double bon. That's ab that's or you call it one in which is same thing as what now they both have C for HA C for HA but their name is quite they quite different who can tell me differences between a boutin and a cybutain tell me difference between butin and cyloane what do you think is their differences even though they are C4 H8 C4 H8 what is different about Oh yeah, I'm waiting for somebody. Thank you. What's different there is a functional group.

[00:34:48]>> It's functional group. See this one?

[00:34:51]This one is just this guy here.

[00:34:58]This is cyclutane.

[00:35:00]Why the other one is a boutin? This one is an aline and this one is what aline.

[00:35:11]The difference is the Isaac you made their functional group not group functional group that's a mistake. So functional group functional group. Thank you. Then lastly for today, somebody will say fu, you said lastly for today like 1 million time. Is anybody asking question?

[00:35:38]Who said B has more than eight hydrogen?

[00:35:43]Peace. Where is it?

[00:35:46]1 2 3 4 5 6 7 8 is it now? Peace. What happened?

[00:36:00]So last thing for today, somebody say last thing for today.

[00:36:05]Are we still >> Are we still online?

[00:36:14]Okay, last thing for today. Can I clean this off? I want to clean this now. The last thing for today.

[00:36:21]Are you happy?

[00:36:30]this I didn't know that now I told you that six and mark what you don't I told you that six and trans you only find it in what and cycl What >> al >> now I've treated it under alken the way you see it under I not say anything about this cylo now for example give me any cy let's say for example >> this is one cycl is one cycl No, you know that's not okay.

[00:37:33]Now if you have something like this then 30 minutes.

[00:37:40]was going the last thing I do.

[00:38:16]Now, >> now have you seen this before?

[00:38:29]>> Now I told you that sis and trans can be found on our king and I think we've discussed that one. Now S and trans can also be found on cylo aline. These are cy alaine. NOW ALL WHAT YOU SAW here is a wedge. This we use it. We have what we call wedge and hash.

[00:38:46]For those who have of that before we have what we call wedge and hash. Wedge means this guy here. This be is pointing towards you. For example, there's a part of me that is pointing towards you people and there's a part that is pointing towards the go. You can only see me. You can only see my face like this. You can't see my back. Can you see my back? No. Now, anytime you see wedge in chemistry, it means that this behav is pointing towards you like this. It's pointing towards you. But anytime you see a wedge, what does it mean? It's pointing away from you. So pointing towards you. Ash, this is ash is pointing away from you. Now in the case of cycle okay they can ask you this is 1 2 3 4 5 this is five now >> yes >> five is cyclbody five what cy what will be cyclopentine five is cylo pentine this is a cycl okay this is cyclopend 1 2 3 4 5 but there's a be out there how many be there two One is one equation number one then the other one two this is three this is four this is five is that okay what 1a what 2 1 2 di what now because it is wedge and wedge because it is what wedge and wedge you will call this because it is wedge and wedge you call it s if it is ash and hash you call it what? Sis. But if it is now what w and hash you call it what? Trans. Go right a cycle. Okay. Now you want to get and trans on them. The first rule is that the first rule you must pay attention is that you compare when they in question one and two to each other. They they can only be in question what and what to each other. One and two. You can see this is one and two. This is also what one and two. This is so there must be question one and two to each other.

[00:40:58]Question one and two each other.

[00:40:59]Question one and two to each other. Is that okay? Then the next the substant that is here must be the substitute that is here. You can see that B is here. Not that B is here and I put here. No, we can't do that. Is that okay? It won't work that way. For it to work, it must be the same thing. B is here. BR is here. Is that okay? Now, and it must be one to each other. It must be one two to each other. Is that okay? That means if one is here, the other one cannot be here. It must be equal to two to each other. So this guy is 1 to 2 1 2 1 2 the next is that what is here should be what is here.

[00:41:38]That's way it can work. That's the rule.

[00:41:40]Now if you have wedge and wedge it is se if you have ash and hash it is going to be what? S. But when do we have trans? Everybody we have trans. when we have wedge you can see wedge and what has it is going to be what trans thank you so what will be the answer to this question so in nutshell if I want to name this compound I would say this compound is a 1 / 2 d what bro what cyclane so it is sure for you somebody is not sure for you. Do this one.

[00:42:51]Yeah. Name it. And is it trans or sis?

[00:42:56]That's do that one.

[00:43:04]>> Oh, yeah. Yeah. Yeah.

[00:43:14]Is it going to be sis or trans? Thank you. Sis. Sis. One. to Datu Cyclim.

[00:43:22]Thank you. One to six. Yes, it is six because this is wedge and wedge.

[00:43:29]Wedge and wedge. Sis, wedge and wedge.

[00:43:32]Sis, hash and hash. Sis, but wedge and hash is going to be what? Trans.

[00:43:40]Thank you so much for today. If now I want you to snap your notes. If you have written your notes, snap it. Then go to my comment section after uploading this video and comment.

[00:43:54]En sure you comment, like, send it to your friend. Let them subscribe. Thank you so much for today. Did I take your time?

[00:44:02]Did I take your time? No. Put cylo. Cycl must be there. Yes.

[00:44:10]I did not explain E and ZBC or you do not need E and Z. E and Z is for part two students and is on my it's on my um is on my YouTube so it is for part so for those who did not come for physical class those who came for physical class I'm giving them something I gave them something came for physical class can you see her they already see you >> everybody's already seeing you >> answer Next question.

[00:44:44]>> Someone who came for the online class.

[00:44:48]They are going for Okay. They are going for shopping now. You do not come now.

[00:44:53]You're not going for shopping. So those people that came people that came are going for shopping now. We carry them for shopping. So you you did not come. Who is this person?

[00:45:03]Good night. He not do giveaway. Okay.

[00:45:06]I'll do giveaway next.

[00:45:09]They will be give away next.

[00:45:12]Thank you so much for today.

[00:45:15]>> Thank you.

[00:45:16]>> So we'll meet in the next class last. Thank you so much.

[00:45:21]>> Tap on the like button. Why are you not tapping on the like button?

[00:45:29]>> Not tap on the like button.

[00:45:34]The allow me. I'm on my way to shopping.

[00:45:39]shopping.

[00:45:47]>> Franjo, I miss I miss you too. I miss everybody.

[00:45:52]He did not come for those people that come for physical class. That's that's the only people that are getting something.

[00:45:59]>> Yeah. So we we are we are going for say if I catch you thank you me don't me you check you check the video later >> byebye