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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)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

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The correct Answer is:
B, D
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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.