Tautomerism is exhibited by:

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(A, C, D) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for the migratio

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Cyclohexane$-1,2-$dione

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(A, C, D) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for the migration of a proton between two polyvalent atoms.$(a)$ $C_6H_5-CH=CH-OH$ (enol) can tautomerize to $C_6H_5-CH_2-CHO$ (phenylacetaldehyde).$(b)$ $p$-Benzoquinone does not have any $\alpha$-hydrogen atoms,so it cannot exhibit tautomerism.$(c)$ Cyclohex$-2-$ene$-1,4-$dione has $\alpha$-hydrogen atoms at the $C-5$ and $C-6$ positions,allowing it to exhibit tautomerism.$(d)$ Cyclohexane$-1,2-$dione has $\alpha$-hydrogen atoms,allowing it to exhibit tautomerism.Therefore,compounds $(a)$,$(c)$,and $(d)$ exhibit tautomerism.

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