The decreasing order of basicity is:(1) CH_3 | vedclass

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(A) The basicity of a compound depends on the availability of the lone pair of electrons on the nitrogen atom.$(1) \ CH_3CONH_2$ (Acetamide): The lone

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$2 > 1 > 3$

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(A) The basicity of a compound depends on the availability of the lone pair of electrons on the nitrogen atom.$(1) \ CH_3CONH_2$ (Acetamide): The lone pair on nitrogen is involved in resonance with the carbonyl group $(C=O)$,significantly reducing its availability for protonation.$(2) \ CH_3CH_2NH_2$ (Ethylamine): This is a primary aliphatic amine. The alkyl group $(CH_3CH_2-)$ is electron-donating ($+I$ effect),which increases the electron density on nitrogen,making it the most basic among the given compounds.$(3) \ PhCH_2CONH_2$ ($2$-phenylacetamide): Similar to acetamide,the lone pair on nitrogen is involved in resonance with the carbonyl group. However,the presence of the phenyl group $(Ph-)$ exerts an electron-withdrawing effect through the inductive effect compared to the methyl group in acetamide,making it slightly less basic than acetamide.Therefore,the decreasing order of basicity is $2 > 1 > 3$.

The decreasing order of basicity is:
$(1) \ CH_3CONH_2$
$(2) \ CH_3CH_2NH_2$
$(3) \ PhCH_2CONH_2$

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The decreasing order of basicity is:$(1) \ CH_3CONH_2$$(2) \ CH_3CH_2NH_2$$(3) \ PhCH_2CONH_2$