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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).