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Question

Tautomerism is not shown by:

A
CH3COCH2CN
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B
HCN
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C
CH3CH = NOH
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D
CH3CN
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Solution

The correct option is B HCN
Solution
Tautomerism is shown where an electronegative atom is connected to C with double or triple bond And there is presence of alpha H atoms
Here HCN has no alpha H atoms
Therefore HCN will not show tautomerism
The correct option is B

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