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B
propionaldehyde
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C
acetaldehyde
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D
formaldehyde
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Solution
The correct option is B propionaldehyde
Base catalysed aldol-condensation occurs with propionaldehyde. Aldehydes
and ketones having α –H atom are treated with dilute alkali ,two
molecules of such compound condense to form β-hydroxy aldehyde and
β–hydroxy ketone. The reaction is called as aldol condensation.