Which of the following is the strongest base?

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(D) To determine the strongest base,we look at the availability of the lone pair on the nitrogen atom.In $C_6H_5NH_2$ (aniline) and $C_6H_5NHCH_3$ ($N

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$C_6H_5CH_2NH_2$

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(D) To determine the strongest base,we look at the availability of the lone pair on the nitrogen atom.In $C_6H_5NH_2$ (aniline) and $C_6H_5NHCH_3$ ($N$-methylaniline),the lone pair on the nitrogen is in conjugation with the benzene ring,which significantly reduces its basicity.In $o$-toluidine $(C_6H_4(CH_3)NH_2)$,the ortho-methyl group causes steric hindrance,further reducing basicity.In $C_6H_5CH_2NH_2$ (benzylamine),the nitrogen atom is not directly attached to the benzene ring. The lone pair is not involved in resonance with the aromatic ring,making it much more available for protonation compared to the other options. Therefore,$C_6H_5CH_2NH_2$ is the strongest base.

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