Which of the following exhibits tautomerism?

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(D) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group $(-C=O)$.In $1,2$-cyclohexanedione,the carbon atoms ad

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$1,2-$cyclohexanedione

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(D) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group $(-C=O)$.In $1,2$-cyclohexanedione,the carbon atoms adjacent to the carbonyl groups possess $\alpha$-hydrogen atoms,which can migrate to the oxygen atom to form an enol tautomer.Structure $A$ is an enol itself,but it does not exhibit keto-enol tautomerism in the same way as the diones.Structure $B$ ($1,4$-cyclohexanedione) has $\alpha$-hydrogens and can exhibit tautomerism.Structure $D$ ($1,2$-cyclohexanedione) also has $\alpha$-hydrogens and is a classic example of a compound exhibiting tautomerism.However,in the context of standard chemistry problems of this type,$1,2$-cyclohexanedione is the most commonly cited example for keto-enol tautomerism among these choices.

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