Question:

A. Phenyl methanamine

B. N,N-Dimethylaniline

C. N-Methyl aniline

D. Benzenamine

Choose the correct order of basic nature of the above amines.

Show Hint

Phenyl methanamine (benzylamine) is an aliphatic amine and is far more basic than the aniline derivatives; among the anilines, N-alkylation raises basicity in the order N,N-dimethylaniline > N-methylaniline > aniline (as per the pKb values).
Updated On: Nov 4, 2026
  • D > C > B > A
  • A > C > B > D
  • D > B > C > A
  • A > B > C > D
Show Solution
collegedunia
Verified By Collegedunia

The Correct Option is D

Solution and Explanation

A (benzylamine, \(\mathrm{C_6H_5CH_2NH_2}\)) is an aliphatic amine: the lone pair on N is not delocalised into the ring, \(pK_b \approx 4.7\), so it is the most basic.
The others are aromatic amines whose lone pair is delocalised into the ring. Electron-donating methyl groups on N increase the basicity: \(pK_b\) values are N,N-dimethylaniline 8.94 (B), N-methylaniline 9.15 (C), aniline 9.38 (D).
Order of basic strength: A > B > C > D.
Answer: (4) A > B > C > D
Was this answer helpful?
0
0