Which of the following compound will undergo self-aldol condensation in the presence of cold dilute alkali?

C_{6} H_{5} C H O

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

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H C \equiv C C H O

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C H_{2} = C H C H O

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Solution

The correct option is B $C H_{3} C H_{2} C H O$
An aldol condensation is a condensation reaction in which an enol or an enolate ion reacts with a carbonyl compound to form a $β$ -hydroxyaldehyde or $β$ -hydroxyketone, followed by dehydration to an $α, β$ -unsaturated aldehyde.
Aldol condensation occurs in aldehydes having $α$ -hydrogen.
Only b has $α$ -hydrogen thus it will undergoe aldol condensation.

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