Which of the following can undergo aldol condensation?

acetaldehyde

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propionaldehyde

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benzaldehyde

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trideutero acetaldehyde

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Solution

The correct options are
A acetaldehyde
B propionaldehyde
D trideutero acetaldehyde
The aldehydes that have alpha hydrogen atoms undergo aldol condensation reaction. Benzaldehyde lacks the alpha hydrogen, so it cannot undergo aldol condensation reaction. In all other options, there is atleast one alpha hydrogen, so they can undergo aldol condensation reaction.

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