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Keto-enol tautomerism is observed in :...

Keto-enol tautomerism is observed in :

A

`C_(6)H_(5)-overset(O) overset(||)C-H`

B

`C_(6)H_(5)-overset(O) overset(||)C-CH_(3)`

C

`C_(6)H_(5)-overset(O) overset(||)C-C_(6)H_(5)`

D

`C_(6)H_(5)-overset(O) overset(||)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-C_(6)H_(5)`

Text Solution

Verified by Experts

The correct Answer is:
B
For a compound to exhibit keto-enol isomerism, presence of `alpha`-hydrogen is necessary. This is satisfied only by acetophenone
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The process whereby a hydrogen atom attached to the alpha-carbon of carbonyl compound moves to the carbonyl oxygen atom is known as enolization or keto-enol tautomerism. Isomeric carbonyl and enol structure are tautomers. ltbgt Normally, the carbonyl form is favoured but structure factor marked affect K_(T) . Which of the following compounds will not exhibit enozation?