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Tautomerism

Which one of ...

Question

Which one of the following cannot exist in enolic from?

A

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B

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C

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D

All of the above.

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Solution

The correct option is B
$α$ -hydrogen to carbonyl carbon is must to exhibit tautomerism.
a and c has $α - H$ to carbonyl carbon thus they will show tautomerism.
Benzaldehyde has no $α - H$ to carbonyl carbon thus it will not show tautomerism. Hence correct option is b.

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