Which of the following is the weakest base?

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(D) In $CH_3NHCHO$,the lone pair of electrons on the nitrogen atom is involved in resonance with the adjacent carbonyl group $(C=O)$.This delocalizati

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$CH_3NHCHO$

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(D) In $CH_3NHCHO$,the lone pair of electrons on the nitrogen atom is involved in resonance with the adjacent carbonyl group $(C=O)$.This delocalization significantly reduces the availability of the lone pair for protonation.Although the $-NO_2$ group in $O_2NCH_2NH_2$ exerts a strong $-I$ effect,the resonance effect in the amide $(CH_3NHCHO)$ is more effective in reducing the basicity of the nitrogen atom.Therefore,$CH_3NHCHO$ is the weakest base among the given options.

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