Q.

Among the following, the strongest base is:

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a

C6H5NH2

b

p-NO2C6H4NH2

c

m-NO2·C6H4NH2

d

C6H5CH2NH2

answer is D.

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Detailed Solution

(4) is an aliphatic amine; so it is stronger base than aromatic amine. Moreover, EWG [(–NO2) at o, m, or p] decreases the basic character.In aromatic amines l.p on N is involved in resonance.(4) > (1) > (3) > (2).
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