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Keto-enol tautomerism is observed in :...

Keto-enol tautomerism is observed in :

A

`C_(6)H_(5)CHO`

B

`C_(6)H_(5)COCH_(3)`

C

`C_(6)H_(5)COOC_(6)H_(5)`

D

`C_(6)H_(5)COCH_(2)COCH_(3)`.

Text Solution

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The correct Answer is:
B, D
`{:(underset((A))(C_(6)H_(5)-overset(O)overset("||")C-H)" "underset((B))(C_(6)H_(5)-overset(O)overset("||")C-CH_(3))),(underset((C))(C_(6)H_(5)-overset(O)overset("||")C-O-C_(6)H_(5))", "underset((D))(C_(6)H_(5)-overset(O)overset("||")C-CH_(2)-overset(O)overset("||")C-CH_(3))):}`
Aldehydes or ketones with acidic hydrogen at `alpha`-position show keto-enol tautomerism. As such both (B) and (D) will show keto-enol tautomerism.
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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?