Keto-enol tautomerism is not observed in :

C₆H₅COCH₂COCH₃

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CH₃COCH₂COCH₃

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C₆H₅COC₆H₅

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C₆H₅COCH=CH₂

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Solution

The correct option is C
C₆H₅COC₆H₅

We know about the necessary condition for keto-enol tautomerism.

One of the major conditions for tautomerism is presence of $α$ -hydrogen

$\to$ - $α$ -hydrogen is present on $α$ -Carbon.

Now,just check which option does not have $α$ -hydrogen

Yeah you are right.

$C_{6} H_{5} C O C_{6} H_{5}$ does not have any $α$ -hydrogen

There is no hydrogen on adjacent carbon.

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Keto-enol tautomerism is observed in

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