Tautomerism takes place in:

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(C) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for keto-enol intercon

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$i, iii, iv$

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(C) Tautomerism requires the presence of an $\alpha$-hydrogen atom adjacent to a carbonyl group or a similar system that allows for keto-enol interconversion.$(i)$ $C_6H_5-CH=CH-OH$ is an enol form which can tautomerize to the corresponding aldehyde.(ii) $p$-Benzoquinone has no $\alpha$-hydrogen atoms available for tautomerization.(iii) This structure has $\alpha$-hydrogen atoms at the $CH_2$ group,allowing it to tautomerize to a phenol derivative.(iv) Cyclohexanone has $\alpha$-hydrogen atoms,allowing it to form an enol tautomer.Therefore,compounds $(i), (iii),$ and $(iv)$ exhibit tautomerism.

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