(i)
The compound name is 3-Methylbutanal. The parent chain contains 4 carbon atoms and a methyl group at the third position.

The structure is as follows:

(ii)
The compound is p-Nitropropiophenone. The parent ring is the benzene ring in which -NO₂ group is present and CH₃CH₂CO- group is present. 

The structure is as follows:

(iii)
The compound name is p-Methylbenzaldehyde. When the benzene ring is attached to the -CHO group then it is called benzaldehyde. At the para position with respect to the CHO group, CH₃ group is present. 

The structure is as follows:

 

(iv)
The compound is 4-Methylpent-3-en-2-one. The parent chain name is pent-3-en-2-one. It contains a double bond at the third carbon and the second carbon is the ketone group carbon. 

Methyl group is also present at 4th carbon. The structure of the compound is as follows: 



(v)
The compound is 4-Chloropentan-2-one. The parent chain is pentan-2-one. It contains five carbon atoms and the second carbon is a ketone group carbon. At the fourth position, Cl atom is present. 

The structure of the compound is as follows:


(vi)
The compound name is 3-Bromo-4-phenylpentanoic acid. The parent chain name is pentanoic acid. It contains 5 carbon atoms. At 4th carbon phenyl ring is present and at the 3rd carbon Br group is present. 

The structure is as follows:

(vii)

The compound is p,p’-Dihydroxybenzophenone. The structure of the compound is as follows:



(viii)
The compound is Hex-2-en-4-ynoic acid. The parent chain contains 6 carbon atoms, the functional group is COOH. At the second carbon double bond is present and at 4th carbon triple bond is present. 

The structure of the compound is as follows: