Keto-enol tautomerism is observed in : ...

Keto-enol tautomerism is observed in :
(i) a.`PhCHO` , b.`PhCOCH_(3)`
c. `PhCOPh` , d. `PhCOCH_(2)COCH_(3)`

A

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

B

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

C

`Ph-overset(O) overset(||)(C)-Ph`

D

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

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The correct Answer is:

B, D

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