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Keto-enol tautomerism is not observed in...

Keto-enol tautomerism is not observed in

A

`C_(6)H_(5)COC_(6)H_(5)`

B

`C_(6)H_(5)COCH = CH_(2)`

C

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

D

`CH_(3)COCH_(2)COCH_(3)`

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