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(B) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom attached to an $sp^3$ hybridized carbon atom adjacent to a carbonyl group

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$II$ only

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(B) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom attached to an $sp^3$ hybridized carbon atom adjacent to a carbonyl group $(C=O)$.Structure $I$ (p-benzoquinone) has no $\alpha$-hydrogen atoms.Structure $II$ (cyclohex$-2-$ene$-1,4-$dione derivative) contains $\alpha$-hydrogen atoms on the $sp^3$ hybridized carbon atoms adjacent to the carbonyl groups.Structure $III$ (o-benzoquinone) has no $\alpha$-hydrogen atoms.Therefore,only structure $II$ can exhibit tautomerism.

Among the given structures,which can exhibit tautomerism?

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