Among the following,the weakest base is:

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(D) The compound $CH_3NHCHO$ ($N$-methylformamide) is the weakest base among the given options.In $CH_3NHCHO$,the lone pair of electrons on the nitrog

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$CH_3NHCHO$

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(D) The compound $CH_3NHCHO$ ($N$-methylformamide) is the weakest base among the given options.In $CH_3NHCHO$,the lone pair of electrons on the nitrogen atom is involved in resonance with the carbonyl group $(C=O)$,which significantly reduces its availability for protonation.The resonance structure is shown as: $CH_3-\ddot{N}H-CHO \leftrightarrow CH_3-NH^+=CH-O^-$.In contrast,the other compounds are amines where the lone pair is more available for donation,although their basicity is influenced by inductive and resonance effects of substituents.

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