Tautomerism is exhibited by...

Tautomerism is exhibited by

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The correct Answer is:

A, C, D

(a). `C_(6)H_(5)-CH=CH-OH hArrC_(6)H_(5)-CH_(2)-CHO` (Aldehydes are more stable than vinyl alcohols)
(b). Does not show tautomerism since its `alpha`-hydrogen is not acidic enoug for migration.

(enol form, i.e., resorcinol is stabilized by resonance energy of the benzene ring)

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