Functional group isomer identification, Retention of benzene ring in reactions, Isomerism in C4H9OH
Acetone, Acetaldehyde, Propen-2-ol are functional group isomers since they have different functional groups. Propylene epoxide is not a functional group isomer of the other three as it has a different functional group, being an epoxide.
In Chlorination with FeCl, the benzene ring is retained as it is not reactive towards substitution reactions under these conditions. The other options involve reactions that would alter or substitute the benzene ring.
The isomers of C4H9OH are 1-Butanol, 2-Butanol, and Iso-butyl alcohol. These molecules have the same molecular formula but different structures.
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