Aldol condensation will not take place in:

H C H O

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C H_{3} C H_{2} 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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Solution

The correct option is A $H C H O$
For aldol condensation, $α -$ hydrogen should be there to produce $α -$ hydroxy substituted compounds.
$H C H O$ formaldehyde don't have $α$ -hydrogens. Thus, it does not undergo aldol condensation.

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