Name and write the structures of all isomers of the propyl and butyl alkyl groups.

Explanation:

Propyl and butyl groups are the alkyl groups formed by replacing the one hydrogen atom from their corresponding alkanes.

Propyl is formed from propane and has n-propyl and isopropyl alkyl isomers.

Butyl is from butane and has n-butyl, isobutyl , sec-butyl and tertiary butyl alkyl isomers.

the answer is option a.