Among the given ketones,the one which does no | vedclass

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(B) For a ketone to enolize,it must have at least one $\alpha$-hydrogen atom.$(I)$ Bicyclo[$2.2$.$1$]heptan$-2-$one has $\alpha$-hydrogens and can for

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$(II)$

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(B) For a ketone to enolize,it must have at least one $\alpha$-hydrogen atom.$(I)$ Bicyclo[$2.2$.$1$]heptan$-2-$one has $\alpha$-hydrogens and can form an enol.$(II)$ $3,3$-dimethylbicyclo[$2.2$.$1$]heptan$-2-$one has no $\alpha$-hydrogen at the $C-3$ position. However,it has an $\alpha$-hydrogen at the bridgehead position $(C-1)$. According to Bredt's rule,the formation of a double bond at the bridgehead of a small bicyclic system is highly unstable. Thus,it does not enolize.$(III)$ Cyclohexa-$2,4$-dienone has $\alpha$-hydrogens and can enolize to form phenol.Therefore,the correct answer is $(II)$.

Among the given ketones,the one which does not enolize is:

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