Which of the following does not undergo aldol condensation ?

H C H O

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C H_{3} C H O

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C H_{3} C O C H_{3}

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C H_{3} C H_{2} C H O

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Solution

The correct option is A $H C H O$
Carbonyl compounds containing alpha hydrogen atom undergoes aldol condensation reaction. Formaldehyde $H C H O$ does not contain alpha hydrogen atom. Hence, it does not undergo aldol condensation reaction. Instead, it undergoes Cannizzaro reaction.

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