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Keto enol tautomerism is not observed in:

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Keto enol tautomerism is not observed in:
A. Phenol
B. Glycerol
C. HCN
D. Benzophenone
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Correct Answer - D
Here (d) `(Ph-oversetOoverset(||)C-Ph)`
does not have `alpha-H` atom and, therefore, does not show tautomerism.
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