A)
B)
C)
D)
Correct Answer: D
Solution :
The basicity of amine group depends on the lone pair present on N atom. If this lone pair involved in the conjugation, the basic character of amine decreases. So, find the molecule in which lone pair of nitrogen does not involve in conjugation.
(an electron releasing
group) increases electron density at N-atom hence basic nature is increased. 
decreases electron density at N -atom thus basic nature is decreased (Lone-pair on N in aniline compounds is delocalised along with 
electrons in benzene). Thus compound (d) is the strongest base.
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