Among the amines (A) CH_3NH_2, (B) (CH_3)_2NH, (C) C_6H_5NH_2, (D) (CH_3)_3N, the order of basicity is [Kerala CEE 2005]

JEE Main Chemistry question

Among the amines , , , , the order of basicity is [Kerala CEE 2005]

(A)C<D<A<BCorrect
(B)D<C<B<A
(C)A<B<C<D
(D)B<C<D<A

Answer: (A)

Solution

Aniline (C) is far less basic than any of the simple alkylamines, since its nitrogen lone pair is delocalised into the aromatic ring by resonance, so it is placed lowest. Among the methyl-substituted amines, trimethylamine (D, 3°) is less basic than methylamine (A, 1°) in aqueous medium because, despite donating

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Question ID VK-150282