Keto-enol tautomerism is observed in...

Keto-enol tautomerism is observed in

`C_6H_5 - overset(O)overset(||)C - H`

`C_6H_5 - overset(O)overset(||)C - CH_3`

`C_6H_5 - overset(O)overset(||)C - C_6H_5`

`C_6H_5 - overset(O)overset(||)C - underset(CH_3)underset(|)overset(CH_3)overset(|)C - C_6H_5`

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The correct Answer is:

For a compound to exhibit keto-enol isomerism, presence of a-hydrogen is necessary. This is satisfied only by acetophenone.

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