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(B) The basicity of amines depends on the availability of the lone pair of electrons on the nitrogen atom. $1$. $CH_3CH_2CH_2NH_2$ (n-propylamine) is

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$2-$aminoacetophenone

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(B) The basicity of amines depends on the availability of the lone pair of electrons on the nitrogen atom. $1$. $CH_3CH_2CH_2NH_2$ (n-propylamine) is an aliphatic amine,where the lone pair is readily available for protonation. $2$. $(CH_3)_3N$ (trimethylamine) is also an aliphatic amine with high electron density on nitrogen due to the inductive effect of three methyl groups. $3$. Aniline $(C_6H_5NH_2)$ is less basic because the lone pair on nitrogen is involved in resonance with the benzene ring. $4$. $2-$aminoacetophenone has an $-NH_2$ group attached to a benzene ring which also has an electron-withdrawing acetyl group $(-COCH_3)$ at the ortho position. The $-COCH_3$ group exerts a strong $-I$ and $-M$ effect,which significantly reduces the electron density on the nitrogen atom,making it the least basic among the given options.

Which of the following is expected to be the least basic?

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