Question

The increasing order of basic strength for the following amines in aqueous phase is
(1) aniline
(2) triethylamine
(3) ammonia
(4) triphenylamine

• A. $ (1) <\, (4) <\, (3) <\, (2) $
• B. $ (4) <\, (1) <\, (3) < \,(2) $
• C. $ (3) <\, (1) <\, (4) <\, (2) $
• D. $ (3) < \,(1) <\, (2) <\, (4) $

Answer 1

Answer: (B)

Aromatic amines are weaker bases than aliphatic amines and ammonia due to delocalization of the lone pair of electrons over the benzene ring
Hence, the order is
Triphenylamine $<$ aniline $<$ ammonia $<$ triethylamine