The preferred sites of protonation in the fol | vedclass

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(A) In compound $(i)$,$N$-methylacetamide,the oxygen atom $(1)$ is more basic than the nitrogen atom $(2)$ because the lone pair on the nitrogen is in

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$1$ and $3$

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(A) In compound $(i)$,$N$-methylacetamide,the oxygen atom $(1)$ is more basic than the nitrogen atom $(2)$ because the lone pair on the nitrogen is involved in resonance with the carbonyl group,reducing its availability for protonation.In compound $(ii)$,$2$-aminopyridine,the ring nitrogen $(3)$ is more basic than the amino group nitrogen $(4)$. The lone pair on the amino group nitrogen is delocalized into the pyridine ring,whereas the lone pair on the ring nitrogen is in an $sp^2$ orbital and is available for protonation.Therefore,the preferred sites of protonation are $1$ and $3$.

The preferred sites of protonation in the following compounds are:
$(i)$ $CH_3CONHCH_3$
(ii) $2$-aminopyridine

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The preferred sites of protonation in the following compounds are:$(i)$ $CH_3CONHCH_3$(ii) $2$-aminopyridine