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Keto-enol tautomerism is observed in...

Keto-enol tautomerism is observed in

A

(i),(ii),(iii),(iv)

B

(i),(ii),(iii)

C

(ii),(iv)

D

(ii),(iii)

Text Solution

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The correct Answer is:
C

Carbonyl compounds carrying at least one `alpha-`H atom on `sp^3` hybridized C or having a carbonly group attached to a methylene group `(-CH_2-)` or methyl group `(-CH_3)` exhibit keto-enol tautomerism:
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Assertion When pure d-1(+)-2 methlylbutanal is treated with diute H_(2)SO_(4) it is racemised completely. Reason It' s alpha carbon is chiral which undergo keto-enool tautomerism in the presence of acid catalyst.

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