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(B) The basicity of amines depends on the availability of the lone pair on the nitrogen atom.$1$. $C_6H_5NH_2$: The lone pair is involved in resonance

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$3 > 2 > 1 > 4$

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(B) The basicity of amines depends on the availability of the lone pair on the nitrogen atom.$1$. $C_6H_5NH_2$: The lone pair is involved in resonance with the benzene ring,making it less available for protonation.$2$. $CH_3CH_2NH_2$: It is a primary aliphatic amine with a $+I$ effect from the ethyl group,increasing basicity compared to aniline.$3$. $(CH_3)_2NH$: It is a secondary aliphatic amine with two methyl groups providing a stronger $+I$ effect,making it more basic than primary amines.$4$. $CH_3CONH_2$: The lone pair on nitrogen is involved in resonance with the carbonyl group $(C=O)$,significantly reducing its basicity.Comparing these,the order of basicity is: $(CH_3)_2NH > CH_3CH_2NH_2 > C_6H_5NH_2 > CH_3CONH_2$,which corresponds to $3 > 2 > 1 > 4$.

What is the correct order of basicity for the following compounds?
$1$. $C_6H_5NH_2$ (Aniline)
$2$. $CH_3CH_2NH_2$ (Ethylamine)
$3$. $(CH_3)_2NH$ (Dimethylamine)
$4$. $CH_3CONH_2$ (Acetamide)

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What is the correct order of basicity for the following compounds?$1$. $C_6H_5NH_2$ (Aniline)$2$. $CH_3CH_2NH_2$ (Ethylamine)$3$. $(CH_3)_2NH$ (Dimethylamine)$4$. $CH_3CONH_2$ (Acetamide)