Which of the following is the strongest base?

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(D) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.In $C_6H_5NH_2$,$p-NO_

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$C_6H_5CH_2NH_2$

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(D) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.In $C_6H_5NH_2$,$p-NO_2-C_6H_4NH_2$,and $m-NO_2-C_6H_4NH_2$,the lone pair on nitrogen is involved in resonance with the benzene ring,which decreases its availability.Specifically,the $-NO_2$ group is an electron-withdrawing group $(EWG)$ that further decreases basicity through $-I$ and $-M$ effects.In $C_6H_5CH_2NH_2$ (benzylamine),the $-NH_2$ group is attached to a $CH_2$ group,not directly to the benzene ring.Therefore,the lone pair on the nitrogen atom is not involved in resonance with the benzene ring,making it the most available for protonation.Thus,$C_6H_5CH_2NH_2$ is the strongest base among the given options.

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