First slide

Basic Strength

Question

Which one of the following amine is most basic

Moderate

A

${CH}_{2} = CH - {NH}_{2}$
B

${CH}_{2} = CH - {CH}_{2} - {NH}_{2}$
C
D

Solution

(1), (3), (4) . . . the lone pair of nitrogen is involved in resonance. Lone pair is in conjugation with double bond.Thus they are less basic.
(2) . . . Lone pair is localized. It is more basic.

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