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(C) The basicity of amines depends on the availability of the lone pair on the nitrogen atom.$(1)$ $NH_3$: Ammonia has no electron-donating alkyl grou

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$3 > 2 > 1 > 4$

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(C) The basicity of amines depends on the availability of the lone pair on the nitrogen atom.$(1)$ $NH_3$: Ammonia has no electron-donating alkyl groups.$(2)$ $CH_3CH_2NH_2$: Ethylamine is a primary amine with one electron-donating ethyl group,increasing electron density on $N$.$(3)$ $(CH_3)_2NH$: Dimethylamine is a secondary amine with two electron-donating methyl groups,making it more basic than primary amines due to the $+I$ effect.$(4)$ $CH_3CONH_2$: Acetamide is an amide where the lone pair on $N$ is involved in resonance with the carbonyl group $(C=O)$,making it the least basic.Comparing the basicity: $(CH_3)_2NH > CH_3CH_2NH_2 > NH_3 > CH_3CONH_2$,which corresponds to $3 > 2 > 1 > 4$.

What is the correct order of basicity for the following compounds?
$(1)$ $NH_3$
$(2)$ $CH_3CH_2NH_2$
$(3)$ $(CH_3)_2NH$
$(4)$ $CH_3CONH_2$

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What is the correct order of basicity for the following compounds?$(1)$ $NH_3$$(2)$ $CH_3CH_2NH_2$$(3)$ $(CH_3)_2NH$$(4)$ $CH_3CONH_2$