Which of the following is the least basic?

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(B) To determine the least basic compound,we evaluate the availability of the lone pair on the nitrogen atom for protonation:$1$. $(CH_3)_3N$ (Trimeth

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$CH_3CONH_2$

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(B) To determine the least basic compound,we evaluate the availability of the lone pair on the nitrogen atom for protonation:$1$. $(CH_3)_3N$ (Trimethylamine) is an aliphatic tertiary amine,which is relatively basic due to the electron-donating inductive effect of three methyl groups.$2$. $C_6H_5NH_2$ (Aniline) has the lone pair on nitrogen delocalized into the benzene ring,reducing its basicity.$3$. $CH_2=CHNH_2$ (Vinylamine) has the lone pair delocalized into the double bond,reducing its basicity.$4$. $CH_3CONH_2$ (Acetamide) has the lone pair on nitrogen delocalized into the carbonyl group $(C=O)$ via resonance. The resonance structure $CH_3C(O^-)=NH_2^+$ significantly reduces the electron density on the nitrogen atom,making it the least basic among the given options.

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