AB Sir Nomenclature part 11

Added: 2026-05-12

[00:00:00]so today we'll start the rules for writing the IUPAC names routes for writing IUPAC names before starting the who's just once again let me remind you the general formula because based upon that only the roots are big the general formula is it says secondary prefects which are chloro bromo nitro fluoro i ago with i if I am I in one of the scenes first we like that then after that primary prefects which is cyclo which is used only for a cyclic compound only five a cyclic not for any other then the root word root word is a nothing but the maximum number of carbon atoms in the main change so I told you earlier also villain organic compound is given to you you need to first find the which is the main chain you have to count the carbon atom you click on the carbon atom we have to find it out which is the main chain it is a finally reaching then that is not a servant work I do make it from view Pentax in this way next is the primary suffix which is only for n in I I am in single bond impinge double bond I am in triple bond and ie means entirely group single bond double bond turpan pollen and guys and the last is your secondary suffix which is your functional group which it reminds the chemical properties of a particular compound the functional group is your alcohol the co h what will let me test all ketone C double bond o what will amita's own aldehyde so what is the fall but is a simple CH o weak acid for carboxylic acid but we use weak acid co which i told you all those things have you just a reminder now based upon this only we will start the rules the first rule is your that is longest chain rule longest chain rule now students we do not have to learn these rules you know how to learn this rule set so I will should I learn these rules no it is not going to yeah you should not learn these rules nobody's going to ask you right Lois chain rule in your exam likes right lowest number rule for your exam never know but you need to understand it properly and you are going to use it for a B that you listenings that is what I got now what is longest chain rule law machine will say is that the same thing if our given compound contains a number of carbon atoms then we will select that particular chain as the longest chain which has got maximum number of branches all right clear so what is that enormous chin who says that suppose it even come contest winning patterns a number of carbon atoms we will select that particular gene as the longest chain which has got maximum number of branches branches means have said you've already secondary graphics which has got so first what I said you first what I need to do is that a longer chain good first we need to find it out which has got the maximum number of diameter then we will see the branches all right fine that means suppose suppose now look here very carefully you look here suppose we are having this yeah we need to first find which is a longest thing from air you should be found from this on now this one or this one what to do we found it don't worry we found it one two three four five six seven first we need to see which is having maximum number of characters then you see the branches one two three four five six sides in this way you got seven one two three four five six are and see now seven both of seven alright here you see the branches because hold the chain having the maximum now for example forget about the branches suppose I put it here okay to try to concentrate so I removed one color now you see 1 2 3 4 5 6 it is having 6 now say sir I will count it in other way also but in other way 1 2 3 4 no because how many we got seven suppose we'll say 1 2 3 4 No 1 2 3 4 no 4 carbon atoms so which is having the maximum number can be written some yet 1 2 3 4 5 6 7 so this is your longest chain this is your longest chain under straight down this is your longest chain yeah I've already said you are here once again I am saying with this one understanding first so we need to count one more example I'll give you one more example suppose we are having this way something this way something we are having it all right this is something you hide let me make it 0 0 now we need to find which is the longest chain we need to find so let us first see all this a straight channels 1 2 3 4 5 6 7 sorry I said here let me write the number so that you come to know so this is your longest gee I think you've got it now here one two three four five six seven how many carbon is a seven carbon atom in the nagas chain sorry let me get four five six seven I wrote it now let it down to this one we may be more let me start from here one two three four otherwise I'd be using a different coloring let me use a different color it okay one two three four this is you five six now seven eight nine ten now you can see one two three four five six seven eight nine ten switches are using definitely this is your own in this particular so we removing this number all right so one two three four five six two three four five six seven yes I remove already the number so this is not longer because it was having seven carbon atoms and this is heavy how many and you can see sorry 10 Cardinals so this is your longest chain this particular one is your longest chain this one alright now this particular one is an audition now what I want to say one thing from Julia then we need not have to see that what is the shape and size of the chain nothing it may be a new segment size whatever it is just we need to see that it should be a continuous see the counting which alludes it should be continuous continuous which for example 1 2 3 4 5 it's not 5 then 6 then 7 8 9 10 11 12 something that it should be a continuous you start from one and you'll end in another end you become from heroes all right that is what I say again I repeat one two three four five six seven eight nine ten eleven twelve it is not in this way that will tell you everything and you don't know it should get continuous change we will start from this side and we'll be ending it here so what are this now what are this which is like outside the longest chain but I said you know they are the branches they are the branches they are the secondary prefix heroes you can see if this is the longest chain so these are the branches automatically comes the branches you do not have to worry and how to know each other branches so first thing is that you select which is along the same I think you got it now how to find out the longest chain got it so first we need to count it out and me we need to find it out that which is a log is she it's in front of you that is it you will have to find the log is it simply count it simply count it and find it out which is the longest you see all right so the one which is lying offset the longest chain is your nothing but it is your run just figure again I write this C is your longest chain as you can see I made a box this is your luggage team and all these are coming under what is that second BRE that is prefix or the branches I think it's clearly University the one part is here example I've given you now next five what I said you what I say the longest chain rule longest reign group suggests that if a given compound Thirteen's and then we'll select that particular team as a long distinct which has got maximum number of branches now this rule where it will be fluid then two or more chains is having the same number of carbon and the longest what I said you know when we reduce pretty clever will include this when two or more chains is having same number the same number of Canada if you remember it in the first case I did it I'm coming back to that of me I wrote children you understood the Sun and now see here so what I did it in the first years let me remove this box let me remove this box let me remove it ok so you know one bar here I'm gone yeah here if you remember it I have put up one more carbon just to revise what we have done it in the previous classes sell you that one I hope it is clear that part now we come to this particular part but I said that if suppose are given chain contains all right if you're given compound pertains to both change having the same number of carbon atom the math we will do see it here it is 1 2 3 4 5 6 7 and here also same thing 1 2 3 4 5 6 & 7 you can see if you count in this way we get 7 atoms if you count in this very good seven items 7 carbon atoms now the ocean will come to you say which I take and along is seen the answer is you will select that particular chain as the longest chain which has got maximum number of branches so we will count it first we will see thus what you can say a straight one first you see the straight one see this one I take a solution so how many branches is day this is one branch this is one branch this is one branch and this is for run that is four branches how many branches we get it four branches in black pen you can see I'm wearing black because these numbers are written in black so I have written I am writing in black penderson okay now it is clear I am dropping it this one and blocking it see now what will I do the next one is what will I do say now I will select I will select this has a longer chain isn't it the blue one as elongation the blue numbers as a longer chain here see if this one 1 2 3 4 5 6 7 now how many branches is the end yet one branch or it to branch 3 branch and four runs here this 4 this is what it can sit down this chain then 1 2 3 4 so your so same thing for branches we got it I wrote it in blue you can see 4 branches now the question is which I am select as long guessing any money can select as a bonus if there are same number of branches than anyone I can select it as the longest chain anyone I can do it as a longest chain all right now about my point anyone even selected as a log is it clear now that is the what I can say you may say then if you are having more number of branches you said then what will you do okay have you understood this one that here anyone excellent a person can select this is the longest in a person can select this also has a longer chain all right anyone now suppose and increasing the branches here let us say I am adding one more branch here buy more branches but what happened here all right so this is your home this chain okay so this also is another branch you can see this is your location this is a long stream I am adding one more carbon here just explaining one more column added it here so now how many branches we got it counted one two three four five because longest chain I'm making a if you don't understand see ya I've made a box now is it clear who you are this is longest generate a static image okay now how many branches is there there one grants to grants three times four runs and five blocks instead of formalities are many five and in stretch and how many times is rehydrate straights and suppose you say no sir I will take this one as the longest chain okay in the straight chain one two three four five okay one two three four five again I am rubbing it I'll show it to you [Music] see now how many branches are having them I'm rubbing this number also so that you will not get confused and rocking this do number of Sandra be alright I am having this rule number now you see now you see what is that that is this one and selecting a cell on this chain this also contains seven carbon atoms okay and selecting this as a combination so how many branches are getting if this is the longest chain how many branches see this is a long listen how many times this is this completely is one branch this is second this one is third all right provide from this one game so this one is what you can say fourth four branches as you can see - all right so in this way in this way what do you find is that that there are four branches here in the straight chain but it having the same number of carbon atoms present in it okay so for that particular purpose we will select heat changes along BC the previous one the blue one be JAXA review understood the children where else are you so if two chains are equal length length means having same number of carbon atoms then I would select that particular chain is along using which has got maximum number of branches if the branches is maximum that I will selected so here in the blue one you can see I have got five branches and in the black one you would see I have got four branches so the one we like isolate the one which is having maximum work branches that was a five we didn't see it here five how it is 1 then it is 2 then 3 4 and this is 5 all right thank you