 Right now, nomenclature of aromatic compounds. Nomenclature of aromatic compounds. See, if you have 4-inch prison here, it is phenol or hydroxybenzene. Phenol or hydroxybenzene. Hydroxybenzene. Phenol is the common name of hydroxybenzene. But you should know the common name also. Organic chemistry is common name also. If you have NH2 present on the ring, it is aniline, the common name. Are you facing aminobenzene? I don't see it. I'll write on both names. CHO. It is benzene dehyde or benzene carbene dehyde. It is benzoic acid. Write on the name benzoic acid or benzene carboxylic acid also. Benzoic acid or benzene carboxylic acid. It is benzoic acid or benzene carboxylic acid. It is the same thing when carbon containing functional growth attack directly on the ring. Benzoic acid or benzene carboxylic acid. Benzoic acid is the IOPN. Benzoic acid is benzene carboxylic acid. In this case, both we can take. Benzoic acid we can take and benzene carboxylic acid we have seen in the rules last class. When carbon containing functional growth attack to the ring, we use carboxylic acid. This one is chlorobenzene. Common IOPN name, chlorobenzene. Or if X is attached here, it is halobenzene. We can also call it as aryl halide. Aryl is actually this group, phenyl group. When benzene ring, you remove one hydrogen from this, it becomes aryl. This is aryl. Say 6H5 is also the same thing. If you remove one hydrogen from alkyne, it becomes alkyne. If you remove one hydrogen from benzene, it is aryl. Generally it is aryl halide. For this one, we can write aryl chloride. Yeah, it is common. Aryl halide and we also call it as phenyl. phenyl, that is almost the same thing. phenyl. phenyl chloride is P H. So that is such a bad condition. Why? You can say like aryl halide. No, no, no. Aryl halide is that only for halogen. Hello, Arim sir. Hello, Arim. phenyl is P H, right. Benzene ring, remove one hydrogen phenyl. If any alkyne group attach on the ring, it is alkyne benzene. What would I call it? We will do it now, just after this one. This one is O C H 3 if you have, it is methoxy bilbine. Right, if any alkyne group we have O R, we will write as alkoxy bilbine. Yes. We do know methoxy ethane. Because O C H 3 is methoxy group. C H 3 O C H 3 is what? Methoxymethane. E T O C H 3 is ethoxy ethoxy ethane. So methoxy ethane. Ether, we have done, no? Yes, that is also the common. Same. Okay. Sir, if it was the same. Okay, it is different. Without the phytosylvanus. This cycle exists. It has been methoxy cycle. Yes. See, all these names we are taking benzene, right? When the ring has this functional group attached directly onto it. When we take the name, we let it with benzene, right? We do not write phenyl in this case. But the ring and side chain if you have. And the side chain contains any functional group. Then this will write it as phenyl not benzene. Okay, so one note you write down after this. If the side chain consists of functional group. If the side chain consists of functional group. The benzene is known as phenyl. If the side chain consists of any functional group. If the side chain consists of any functional group. Then the benzene is known as phenyl. For example, if you have a ring. And just, you see. O H present here. So when the side chain contains functional group. Then this becomes the parent chain. And this becomes a subsequent. So the name of this ring will write here. phenyl but not benzene. So what is the name of this compound? Numbering is 1, 2, 3. Sir, why is it not araraya? Why is it not araraya? Why your name is not Achekumar? Sir, it is 1, 2, 3. So it is 1, 2, 3, 4. So 1, 2, 3, 4. Sir, why is it 1, 2, 3. Sir, why is it 1, 2, 3. So it is 1, 2, 3, 4. So what is the name of this ring? What is the name? You work here for this ring. Name here, I have to use that name. This is araraya. This is araraya. This is araraya. Benzene is araraya. Because the side chain, if it contains any function, look. And we don't write this as benzene. We write this tonight. This is the rule we have. Okay, so you cannot argue. Why my name is Gaurav? Why not any of it? You cannot do that. Okay. Okay, so the name of this compound is what? 1. Penyl. Propenol. Propenol. Propenol. Propenol. Propenol. Propenol, if you write it understood. But it is better to write 1-ol. Because when you write propenol, see, actually I will tell you one thing. When we start the numbering from the carbon atom of the functional group. Like in the case of aldehyde, carboxylic acid. or you know that acid halide, okay, there you do not have to write down the position of the function of the group because it is understood that we have to start numbing from the carbon atom of the function, it is a rule we have, okay, but when you write propanol it is understood that OH is present in the first carbon, but it is always better to write the position of OH here because when you write propanol simply, it may be possible that the position of OH is second and third carbon, but generally when we start numbing from the carbon atom of the function group, there we do not write the position of the function group because it is understood, the rules we have for that, okay, but in this case I suggest you always write down the number, if you do not write it is fine, not wrong, but better you mention it, okay, propane 1 always, understood this, so whenever the side chain we have any function group, we do not write benzyde here, like phenyl, okay, take out as this, right, okay, so this one is the function group, phenyl is not a functional, it is a substituent, now this becomes a substituent because this contains the function group, it has the least priority, even if you see the molecule is this, right, the molecule is this, double bond we consider as a functional group, so this becomes the parent chain now, 1, 2, 3, 3 phenyl, propane, propane. Sir they just said propane all with no number and MCQ they gave us the word shift positions 1, 2, 3 and all of these, we did not leave 1 with all of these, it is 1, it is understood that 1, if you do not write it is understood as persuasion, right, 2 and 3 if it is there you have to mention it, if the side chain contains it is not a function group, we are not considering this as a functional group, point is whether this we can take as a parent chain or not, this we can only take when the side chain does not contain any function group, if it contains do not compare this with the priority or thing now, okay, either you can take this as a primary chain or this as a primary chain, if this contains any functional group this becomes a substituent, so priority or do not, right. Sir if there was no double bond it will just be propane. Let me write, yeah propane, like for this one if double bond is there the name of this will be 3 phenyls, propane E or propane, okay, but if double bond is not there, this becomes a parent chain, for example this one you see, right in this case it is propane benzene, so we are using benzene here and here we are using enamel. This also you must remember, enamel for this, so it is the first one, 2, 3 and 4. Yes, ethyl, so is it N ethyl benzene, what is N H 2 and this ring, so one thing is what we can write N ethyl aniline that also we can write or we can also write N ethyl aminobenzene, benzene amine, N ethyl benzene amine you can, benzene amine, benzene amine, aminobenzene we do not write because aminobenzene is the prefix of this, N ethyl benzene amine or N ethyl aminobenzene amine or N ethyl aniline, see this one, this example we have done, one thing I tell you here, N ethyl we are in C L, right in some book they have given this thing that the priority of N ethyl is more than that of emulgenate, right in some book they have taken same priority of all this, okay, so in that case what you have to do the numbering will be done in such a way, so that you will get lowest sum of the brackets, right that is why you see this example, we have N ethyl here, see in this one also the priority order is this given in a sum book but N ethyl we are in C L they have almost same priority, it is not dominant like, no, no, it is like, like I said no, sulfonic acid and suboxalic acid, right, there is a conclusion of priority order, I am talking about priority order, in the book it is called as the biopac only, but some book it is followed sum of brackets, lowest sum of brackets, in some book they have taken and no two is dominating over dominant or alkyl groups, what I follow and telling you, you have to follow the lowest sum of brackets in your C L, I am telling you this because you do not get confused if you see this in the book also, okay, that is why I am giving you all the information here, the better way is to follow lowest sum of the brackets, okay, like in this one you see we start numbering from this carbon atom, because any other carbon atom if you take the sum of the brackets will be more, what is sum of the brackets here, 1 plus 2 plus 4 that is 7, if you start from here you will get 1, 2, 3, 4, 5, 6, 1 plus 3 plus 6 that is 10, right, if you start from here then what you get 1, 2, 3, 4, 5, 5 plus 4 plus 1 again 10, so this numbering gives you the lowest sum of the brackets and that is why we are following this, so according to this if you follow here we have to start numbering from 1, this carbon atom then only you will get the lowest sum of the brackets too, this is lowest sum of the brackets, so 1 is this, 2 is this, 3 is this, 4, 5 and 6, sum of the brackets is 4 plus 1 that is 7, right, if any other numbering you will do you will get more than 7 as the sum of the brackets, right, so the name of this one will be 4 bromo, 1 chloro, 2 nitro, benzene, always we will follow this one, we won't follow this order over here, right, sum of the brackets will follow this, understood? Groups have same, NO2 we have X, so halogen atom we have, hydrogen, only these two will get 1, it is N-ethyl aniline or N-ethyl benzene amine