Which of the following is the weakest base?

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(D) The basicity of an amine depends on the availability of the lone pair of electrons on the nitrogen atom. In $CH_3 - NH - CHO$,the lone pair on the

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$CH_3 - NH - CHO$

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(D) The basicity of an amine depends on the availability of the lone pair of electrons on the nitrogen atom. In $CH_3 - NH - CHO$,the lone pair on the nitrogen atom is involved in resonance with the adjacent carbonyl group $(C=O)$,which significantly reduces its availability for protonation. In $O_2N - CH_2 - NH_2$,the $-NO_2$ group exerts a strong $-I$ effect,reducing basicity,but the resonance effect in the amide $(CH_3 - NH - CHO)$ is much stronger in decreasing the electron density on nitrogen. Therefore,$CH_3 - NH - CHO$ is the weakest base among the given options.

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