Among the following,the strongest base is

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(D) is an aliphatic amine; therefore,it is a stronger base than aromatic amines. In aromatic amines,the lone pair of electrons on the nitrogen atom is

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$C_6H_5CH_2NH_2$

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(D) is an aliphatic amine; therefore,it is a stronger base than aromatic amines. In aromatic amines,the lone pair of electrons on the nitrogen atom is involved in resonance with the benzene ring,which decreases its availability for protonation. Furthermore,the electron-withdrawing group $(-NO_2)$ at the $o$,$p$,and $m$-positions further decreases the basic character due to the $-I$ and $-M$ effects. Since $C_6H_5CH_2NH_2$ is an aliphatic amine where the nitrogen is not directly attached to the benzene ring,it is the most basic. The basicity order is: $(D) > (A) > (C) > (B)$.

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