AB Sir Nomenclature part 14

Added: 2026-05-14

[00:00:00]so we have done in nomenclature already there is the rules we have started and we have done the longest chain rule so once again let me tell you in the longest chain rule what you need to do is that you need to find the maximum number of carbon atoms the maximum number of carbon atoms we have to find it out in the longest chain correctly now if two chains are equal then then you have to see you have to select that particular chain is a longest chain which has got the maximum number of branches all right now we also seen that suppose binding number in what we are supposed to do we are supposed to follow the first point of difference rule that is the best one because always the sum of look at through lose some of the control is not valid I give the examples next suppose if you are having the alkyl group that is alkyl groups are placed at two same positions from either of the engines all right let me give you the example of it I landed five then in that particular case what you find is that if the locals are the same from either of end of the alkyl groups look ends tokens means the locations of the prefixes that scored okay I told you so then what we need to do is that there you need to write it you have to give the preference to alphabetical order all right there you need to get a preference suppose as I said you define limit is there then you are going to be preference to get high first then methyl so we try to get the lowest number methyl you get the highest number similarly I give the example having proven bromo from either of them so in that case again alphabetical order Chloe we get what you can say the sorry bromo we get the least number then that is we can say because in alphabetical order Bravo come first then after that clue so all these things we have AK told you and also have told you that by writing my opinion you need to see that you are having a primary suffix and the secondary suffix if the primary suffix ends with in I in or I that means if I say defends its power Lu taught it at the primary suffix ends with a vowel and the secondary suffix starts with a vowel then the e of the primary suffix that is your in ein n or own or many other you would be good in it that is e of the primary suffix is being removed the primary suffix are for exiting in mi9 ie alright so he of the primary suffix is removed that it was from right here so even the primary suffixes are move so next is after that you have to find out we need to do is that that is in the rules what to do is that suppose we are having a complex group today we are going to start that if you are having a complex group but in that case what are you supposed to do the complex group is their complex group means let us say we are having this one let us say you're having this one yeah [Music] so let me say up here having this okay not more let me put the hydrogens it will be CH 3 it will be ch2 here will be CH to be ch3 no I hope you know how to find it out that how many hydrogen atoms you have to put right here one hydrogen here two here one and here also one heroes three in this way correspondingly here is true if you see the bonds and the meaning is hardian do bonds do I did it here are three bonds but I didn't hear one born three hydrogen here two bonds to hydrogen in this we correspondingly here you can see is ch3 ch3 six to fine so what I need to do first is I am given this particular compound I need to first find it out the longest chain okay I see the different options one two three four five six seven eight nine nine carbons one two three four five six seven no we got nine here 1 2 3 4 5 6 7 8 or 1 2 3 4 5 6 7 H or H whichever way you go it is H ok let us see this one 1 2 3 4 5 6 7 8 whatever so hence which is the longest chain we got it which is the longest thing we got this as the longest chain isn't it this as the longest chain we got it counted one two three four five six seven eight nine carbon this has the longest chain I got it because others are either 8 or 7 so first see what I am doing and finding out the longest chain now here I am writing that we zoom in las casas give you an example they I took each carbon atoms there just to show that if they chose the two chains are of equal length then we will select that particular chain is the longest chain which has got the maximum number of branches just to give an example isolated tension okay but here I am writing the IUPAC name what I said you a complex if change is there then what we need to do so here I am writing IUPAC name all right before writing IUPAC name you should remember this formula what is that prefects primary prefix root word then primary suffix and the next is your secondary something this formula you need to remember it alright so what I got this is a long machine you can see I've got it nine characters now my next thing is that what I need to do I need to do the numbering from each end I should start unless I have got two it's either this side or the same so if I start from this end one two three then branching comes first in a third card right here this design if I start one two three here those a branching comes the third carburetor fine now next is forfeit clear so fifth you are having this particular a complex branch you are having it here in the fifth you can see a complex branch you're having it but it now next is what you find is that if you start from here one two three four five fifth you are having a complex branch cut it here also same thing same branch here that these third position one let me write it down that's better for you then you will understand from this direction the first is your third the looking we get in third position one two three four five six seven eight nine okay so third position I get it one branch in third then fourth fifth fifth I get it on the branch I hope you skated now I'll be using a different colored ink that is from this direction if I do then it is one two three four five then six seven eight nine now see it so I get it the branching here which position same thing third position went back negative and 5th position another regulator now same branching it is same same time so the time and this is I'm going to say you what is that it's a complex part how to name it that complex branch and visit it so in this way you get it so there is no difference then from which ever side you start counting there is no problem from each other side because in Bulgaria the answer will be the same for which were cycling start counting if you start content of this a and B time is coming at this complex ranch and from this end if you start third question with hi is coming and big push in the same complex so which other side you like to count you can do in this particular case okay understood now so I am grabbing each one and keeping the blue one that is better and keeping it the blue one okay darker one and keeping it that is both the same that's why I'm keeping the poker so now but if I'm that let me write first second three perfects because for writing IEP is an innocent but you have to do is that first as you are learner newcomers you don't know how could I die PC games all right you might have studied in lower classes a smaller one with in between probe in doubles now you are learning the big paper so hence for that particular purpose you write the process which I am saying it you apply the process once you become master in this once you learn it with everything properly you can write directly the names like nowadays we already directly the names we don't write in this manner the way I'm teaching yeah all right I see the Cathar and directly tell you the names all right but now as I'm saying you you follow it and practice it once you become sure you will learn everything you're sure we are confident that yes I can write directly the name perfectly right now no problem but first you turn it this way as I'm teaching you so in third question what you get it with high proportion with high now come to the fifth position C is a complex branch in fifth position so what if I decide that number it will start from here because branching starts from here listen carefully the numbering is going to start from here one two three correct one two three the numbering starts from here this is a complex run the branching it starts here one two three or you can say one two three or one two three it is not advanced to than are you know so yeah oh sorry see what is that longest in three carbon atoms if I go in this way I get two carbon atoms if I go in this way three this also three same thing all right so either this way or this way or this or it but not in this way not in this way because you have to got not getting it but if I create this vendor in three carbons so ultimately now this becomes another maintain another meat for the branching this is another major sorry try to understand this is a branch I'm getting a complex branch in third branch this becomes a main chain and hence this becomes your perfect so this has been done to simplify it like it max to simplify the things he also a mystery simplified I simplified it so whatever is simplified and got first question the time second position to meet high negative to be hiding at second question so how will I write down this particular how to write it up c5 the main thing is five from five it starts five what will I write one two - first question under type second question to be type one two - what nominee is there 3 1 - to try if I see one - two prime time and what is the root here prop because three carbon atom prop but what is prom is it propane no why because see here propane means the branching and still like it will be ch3 ch2 ch3 but what we see here one branch is there that means I am removing hydrogen from here and I have done a branching here in the main chain I have removed a hydrogen from here and I have done a branching so if I remove an hydrogen from alkene and I get a branch what is that that is probably why it is provide the go three times on top it should be propane but from propane everywhere hydrogen from here you see very clearly the branching starts from here so even when hydrogen and I got a crunching here so what it should be from Allegheny ferry move on hydrogen and if I get a branch I told you earlier the body I read Alpine said will be 1 through PI so I got it clear so Gibson see carefully one two two triangle I'll provide so this is me we knew that complex chain branch you make it simplify simplify just like in max is simplified got it so secondary prefix you got at this particular done and when you're writing this should be alphabetical order this should mean alphabetical order got it yes now here this is my PI and price so try this is one word now I told you that mono di tri tetra penta there the numerical prefixes and it is not included in well or in the alphabetical order by writing that it is named Megan I repeat mono died trying to draw Penta they tell you the numerical prefixes that behind comes how many times three times that denotes a numerical prefixes but here this is one bird trying time so hence P and M which comes first in alphabetical order M definitely so hence I write this particular first alright but if it is separately like suppose this is not a complex chain mind if this is not a completion and it comes trying time then try mono die tetra penta these are numerical prefixes and they are not considered in alphabetical order while writing the IUPAC name but in complex chain it is second to be a single word and it is being considered so listen carefully my rules and points so after senator Pratt experimenter fixes it no because this is aliphatic what is a root word how many calories say the main chain nine so it is non then primary suffix what is that it is n all right because all are carbon-carbon single bond so what are you go to the name now after that you can write our UPC name what is that you got it three in the tile just you have to write it down the whole thing once again one two to try with time through PI you have to writing brackets because this whole thing comes under five there but it's not you get it no name sweetie if you follow this order we don't have secondary suffix a functional group we don't have finished this is how do we write the I hope is the name of the complex tone now children you have to practice a lot let me finish some rules then after that I will be giving you regularly some homework and have to practice a lot practice only will make it perfect in this but I only practice regular practice thank you very much