 Now, what is complex substituents you see suppose I will write down this example heading you write down complex substituents complex substituents are those substituents are branch which contains branch branch contains branches suppose this example 1 2 3 4 5 6 7 8 and at this position we have this group ok. Can you tell me the longest chain? Can you tell me the name of this compound? What is the length of the compound? 2.5. 2.5. So, is it 2.5? 1 2 3 4 5. What is the length of the compound? Oh, it is 2.5. So, you see here one thing the parent's stop talking the parent's chain is this right and this group is attached to the parent's chain right. Now, this group you see the I know rule is what to number this substituents actually the substituents you can either take this as the parent's chain in the substituents or this as the parent's chain. You see this is attached to the parent's chain you can either take this as the parent's chain if you take this as the parent's chain this becomes a substituent of the substituents ok. So, if I take this as 1 or 2 then this will be methyl is the substituents of this ethyl group correct. If you take 1 and 2 here then this methyl becomes the substituents of this ethyl group right. Do you see the branch is what suppose if I take this example suppose the simpler one is this 1 2 3 4 5 6 7 8 and here we have this look this what is this ethyl right. Now, in this ethyl one hydrogen here is replaced by with what 1 methyl group right. So, this methyl is the branch of this substituents right. So, the branch itself contains branch. So, this substituents is what it is complex substituents. So, which one would you consider the branch? Wait money complex substituents complex substituents you understood right branch itself Now, in this the rule is what to name this complex substituents you have to start the numbering in this complex substituents from the carbon atom which attached with the parent chain ok. We cannot start from this carbon 1 2 3 nickels right. We have to start from this carbon the carbon atom with which the parent chain is attached right. So, if this is 1 you can take either this as 2 or this as 2 1 2 3 nickels because continuous we have to write down the numbering right. So, if it is 1 this is 2 or this is 2 if this is 2 this methyl is the substituents of this ok. So, the name of this compound if you want to write we know the position of this complex substituents that is what that is at 4th position ok. So, 4th 4th dash here we will have the name of complex substituents ok and then how many carbon atom 8. So, it is octane ok you can write this bracket or you if you do not write that is also fine here simply dash also you can write. So, 4 dash 1 methyl right 1 methyl and how many carbon atom in the complex substituents 1 2. So, it is ethyl not ethane 1 methyl ethyl octane ok. So, 1 methyl ethyl is the name of this complex substituents. The position of this complex substituents is 4th position 4 dash 1 methyl ethyl octane is the name of this compound. Sir, there is a space between ethyl. No, no, there is no space. Sir, what is profile? Sir, only profile. Profile is the only profile. Profile is the only profile. Sir, because the numbering from that carbon that is attached to the energy. See, if it is profile then what is this? Sir, if it is profile then what is that? What is this profile then what is this? Sir, it is profile. What is this there? Is this profile? Sir, what is the. 1, 2, 3 it is in the parent phase. Part of the parent phase. We are already counting this in the snow that is how we know the area. 1, 2, 3. So, this one is propyl 1, 2, 3. If this is propyl, this cannot be propyl. The purpose of IUPAC nomenclature is what? Each and every compound will have a different name. If this is propyl, this is not propyl. But this one is not propyl. Why? Because we have to start numbering from the carbon atom of the complex substituents, which is attached with the parent chain. So, in case of this complex substituents, this di term, di tri tetra if you write, that will consider in alphabetical sequence. Do not ask me why it is the rule. I said what, when the complex substituents we have, then di tri tetra will consider in alphabetical sequence. In simple substituents, di tri tetra are not, we would not consider that into the alphabetical sequence. That is why here you see D ethyl and methyl we have. So, E and M we are comparing. Now, some other example, need to copy this one? I will write down some other examples. Tell me the name of this one. Wow. Wow. So, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, so, We can take this as first, the cardboard which adapt with the parent check, first cardboard. Now we can take this as 2 or this as 2 or this as 2. Suppose I take this one as the second card. The name of this is 1 comma 1 dimethylethyl, okay. So the position of this is 5, dimethylethyl we have here. This is profile and this is methyl. Ethyl profile methyl, which one we should write first? First we write ethyl, then methyl and then profile. So, the name of this compound is at fifth position we have 1 comma 1 dimethyl dimethyl 2 dimethyl, then we will write 2 dimethyl, 2 dimethyl, so 1 will be for a 3 dimethyl profile So, 2 carbon, right? So, ethyl and at first we have 2 methyl group, so 1 comma 1 by ethyl This one, this is the variation is this This is the parent here, right? So, it is one substituent, another substituent So, the name is longer than the compound, what is the point of naming it? If you draw the comma, you will get one, so the worst case is what? You lose 4 marks See, there are 2 different types of notches, so you will have 3 different types of notches You won't have 3 different types of notches So, the worst case, you don't dimethyl, dimethyl, the difference will be trust in the end Not because of that, because it is complex substituent, the parent chain has 2 carbon atoms So, it is ethyl, so we have to write this in the last, all the parent chain, the carbon atoms will write in the last known etch So, if you name only this, it will be 1 comma 1 dimethyl ethyl, because 2 methyl is a part of substituent The chain is this ethyl But, there is no other substituent here, suppose if you write down here one including ethyl, suppose if I write down iodine, I like this 1 comma 1 will write dimethyl first, because then this dimethyl and iodine we are comparing Right, but we have only one substituent, one kind of substituent, that is dimethyl only So, here that thing is not there Yes, the parent chain is 2 carbon, so it is ethyl for that It is not the substituent, it is the parent chain of this complex substituent This complex part gets priority What priority? What is the priority? The parent chain You know that we will see only alphabetical sequence Only alphabetical sequence Sir, I did not get a complex substituent You have a complex substituent No, second or second No, I am not getting a complex substituent Sir, I start numbering by that Sir, I start numbering by that Sir, I start numbering by that Sir, I start numbering by that Sir, this is the reason we have this boundary The nature Sir, I see- How complex it is But we can't say Sir, for example At the end there should be Theme In this they are pelvis Sir, there is a complex So now it goes like this. I have already done it. Sir, sir, we have a change. Sir, I will do this one. Sir, you do this one. Sir, you can do that. Sir, you can do that. That's simple one. From here, we'll start the... Yeah. Sir, it'll be three years. No, that's just... Right? We'll do this and then we'll see. Sir, it'll be three years. Okay. In this one, we'll start. How many from the left side? Sir, four. Left side? One, two, three, four, five, six, seven, eight and nine. Okay? Now, in the fourth question, we have Ithail. And here we have... Ithail, Ithail, Ithail, Ithail. One Ithail Ithail. So what will you write here? Four Ithail, five Ithail, Ithail. First we'll write Ithail or Ithail Ithail. Ithail, sir. Four Ithail, Ithail, Ithail. Ithail, Ithail, Ithail. Five, one Ithail. Ithail, no, Ithail. Ithail, no, Ithail. No, Ithail, no, Ithail. No, no. Sir, but in both the branches, Ithail, the complex one, also the best, you know, the complex one has Ithail. It is a variation of the complex substitutes. Both here Ithail, then we compare this. M here. E comes first. In this one, the variation is what? One, two, three, four, five, six, seven, eight, nine, 10. Three times Ithail, four, seven, eight, take it. Okay. Three, five, Is this a complex of children looking at? Yes. No. It is. It is. Okay. So the numbering is what? So, one eta is one eta. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. Yeah, right? Correct. Is? One file, no file, one, no file. No. The profile is 300 ml. Get all right to face. Thanks. See you. See you. Bye.