Base catalysed aldol condensation occurs with:

benzaldehyde

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2-methyl propanal

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2, 2-dimethylpropanal

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Formaldehyde

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Solution

The correct option is B 2-methyl propanal
Benzaldehyde, 2, 2-dimethylpropanal and formaldehyde do not contain alpha hydrogen atom. Hence, they undergo cannizaro reaction on treatment with base.
2-methyl propanal contains an alpha carbon atom. Hence, on treatment with base, it undergoes aldol condensation reaction.

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