Among the following,the weakest base is:

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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.$1$. $C_6H_5CH_2NH_2$

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$CH_3NHCHO$

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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.$1$. $C_6H_5CH_2NH_2$ and $C_6H_5CH_2NHCH_3$ are primary and secondary amines where the lone pair is localized on the nitrogen atom,making them relatively strong bases.$2$. In $O_2NCH_2NH_2$,the $-NO_2$ group is a strong electron-withdrawing group,which decreases the electron density on the nitrogen atom,reducing basicity.$3$. In $CH_3NHCHO$ ($N$-methylformamide),the lone pair on the nitrogen atom is involved in resonance with the carbonyl group $(C=O)$,significantly reducing its availability for protonation.$4$. Comparing the two,the resonance effect in the amide $(CH_3NHCHO)$ is much stronger than the inductive effect of the nitro group in $O_2NCH_2NH_2$. Therefore,$CH_3NHCHO$ is the weakest base.

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