The given substrate is six membered Aromatic hydrocarbon with presence of carboxylic acid functional group on carbon chain outside the ring for which systematic IUPAC Nomenclature will be as follows: Identification of root word and suffix: Since all three - CH 2 COOH group can not choose simultaneously as root word so the root word will be six carbons of aromatic ring the carbon chain having - CH 2 COOH group. Here suffix is - acetic acid which is used with 6 carbon root word ' Benzene ' . IUPAC numbering of root word and naming: Do the numbering of 6 carbon root word such as it will give 1 , 3 and 5 number to - CH 2 COOH groups. It is very interesting molecule so now do secondary numbering of three - CH 2 COOH groups as 2 , 2 ' , 2 ' ' forms. The IUPAC name of this compound is 2 , 2 ' , 2 " - ( Benzene - 1 , 3 , 5 - triyl ) triacetic acid. Here the triyl word is used with suffix which indicate the connection of three acetic acid groups on benzene at position 1 , 3 and 5 . Here Ethanoic acid can not be used because there is possibility of only one root word in IUPAC name of compound and here it is benzene. 2 , 2 ' , 2 " will indicate the positions of three - COOH groups with respect to benzene ring.

The given substrate is six membered Aromatic hydrocarbon with presence of Ester functional group directly present on the ring for which systematic IUPAC nomenclature will be as follows: Identification of root word and suffix: Since, the benzene ring is present on carbonyl group of ester so, the root word will be six carbons of aromatic ring. Here suffix is - oate which is used with 6 carbon root word Benzene. IUPAC numbering of root word and naming: Do the numbering of 6 carbon root word such as it will give 1 number to - COOCH 3 group then - Cl will get 4 number as substituent. The IUPAC name of this compound is 4 - Chloro methyl benzoate. Here, Chloro and methyl will be taken as secondary prefixes along with root word benzene and secondary suffix - oate.

The given substrate is six membered Aromatic benzene hydrocarbon with presence of carbon chain along with double bond for which systematic IUPAC nomenclature will be as follows: Identification of root word and suffix: Since, the benzene ring is present on carbon chain with double bond so, the root word will be 3 carbon chain because of more priority to double bond as primary suffix. Here, suffix is - ene which is used with carbon chain root word prop. IUPAC numbering of root word and naming: Do the numbering of 3 carbon root word such as it will give 1 number to benzene ring group then - CH 3 will get 2 number as substituent. The IUPAC name of this compound is 2 - methyl - 1 - phenylpropene. Here, phenyl and methyl will be taken as secondary prefixes along with root word prop and primary suffix - ene.

Substituted benzene rings the benzene ring is noted by using a phenyl prefix on the alkane name, since side chain contain functional group. Double bond is names -ene with its position. 2 , 3 - diphenylprop- 2 -enal

In this compound side chain contains ester group, hence benzene ring will be treated as phenyl prefix with nitro group at position 3 . Esters are named as alkyl alkanoate. Alkyl chain is not included in numbering. So, the name will be Ethyl- 2 -methyl- 2 -( 3 -nitrophenyl)propanoate.