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Question: Which among the following compounds contains amino group?...

Which among the following compounds contains amino group?

A

N-Phenylbezenamine

B

N-Methylmethanamine

C

N,N-Dimethylbenzenamine

D

4-Bromoaniline

Answer

4-Bromoaniline

Explanation

Solution

  • Option A: N-Phenylbenzenamine (diphenylamine) has the structure Ph–NH–Ph. The NH is bonded to two phenyl groups and is not in the form of a free –NH₂ group.
  • Option B: N-Methylmethanamine is essentially CH₃NHCH₃, a secondary amine, and does not have the free –NH₂ moiety.
  • Option C: N,N-Dimethylbenzenamine (or N,N-Dimethylaniline) is a tertiary amine, lacking any hydrogen directly attached to nitrogen.
  • 4-Bromoaniline: This compound has the structure 4-Br–C₆H₄–NH₂, where the –NH₂ group is clearly present.

Thus, the only compound that contains an amino (–NH₂) group is 4-Bromoaniline.