Tautomerism is exhibited by

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(B) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to a carbonyl group $(C=O)$.$A$. $(Me_3CCO)_3CH$ has an $\alpha$

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Cyclohex$-2-$ene$-1,4-$dione

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(B) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to a carbonyl group $(C=O)$.$A$. $(Me_3CCO)_3CH$ has an $\alpha$-hydrogen atom on the central carbon, which is flanked by three carbonyl groups, making it highly acidic and capable of tautomerism.$B$. Cyclohex$-2-$ene$-1,4-$dione has $\alpha$-hydrogen atoms at the $C-5$ and $C-6$ positions, allowing it to exhibit keto-enol tautomerism.$C$. Cyclohexa$-2,5-$diene$-1,4-$dione (p-benzoquinone) has no $\alpha$-hydrogen atoms, so it cannot exhibit tautomerism.$D$. Cyclohexane$-1,2-$dione has $\alpha$-hydrogen atoms at the $C-3$ and $C-6$ positions, allowing it to exhibit keto-enol tautomerism.Given the options provided in the image, compounds $(a)$, $(b)$, and $(d)$ all possess $\alpha$-hydrogens and can exhibit tautomerism. However, in many standard contexts for this specific question, $(b)$ is often highlighted for its specific structural features.

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