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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm162

Select the correct statements about keto-enol tautomerism.

Aat room temperature the enol form of propanone predominates
Bpropanone and prop-1-en-2-ol are tautomers and are treated as functional isomers
Cbenzaldehyde shows keto-enol tautomerism
Dethanal and ethenol ( $CH X_{2} = CHOH$ ) are tautomers

Answer: B, D

Tautomers interconvert by an H shift and differ in functional group. Propanone/prop-1-en-2-ol and ethanal/ethenol are such pairs. Benzaldehyde has no alpha hydrogen, so it cannot form an enol; and for simple ketones the keto form is overwhelmingly predominant.

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