Tautomerism is not shown in :

C H_{3} N O_{2}

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C_{6} H_{5} C O C H_{3}

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(C H_{3})_{2} C = N - O H

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C_{6} H_{5} C H O

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Solution

The correct option is D $C_{6} H_{5} C H O$
Presence of $α$ -hydrogen atom is a necessary condition for tautomerism. Here in benzaldehyde, there is no alpha hydrogen atom present in the compound. Thus, it does not show tautomerism.

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