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(C) Tautomerism is a type of structural isomerism where a chemical compound exists in two or more interconvertible forms that differ in the position o

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both $I$ and $III$

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(C) Tautomerism is a type of structural isomerism where a chemical compound exists in two or more interconvertible forms that differ in the position of a proton and a double bond. Structure $II$ is phenol,which is an aromatic compound. Structure $I$ is $2,4$-cyclohexadien$-1-$one,and structure $III$ is $2,5$-cyclohexadien$-1-$one. Both $I$ and $III$ are keto forms that can tautomerize to the more stable aromatic enol form,which is phenol $(II)$. Therefore,both $I$ and $III$ are tautomers of $II$.

The tautomer of $II$ is

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