Q. Which of the following undergoes aldol condensation?
(1) Acetaldehyde
(2) Propionaldehyde
(3) Trideuteroacetaldehyde
(4) Benzaldehyde

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Solution:

Carbonyl compounds having atleast one atom are able to undergo aldol condensation.
The structures of the given compounds are as
image
Thus, acetaldehyde, propionaldehyde and trideutero acetaldehyde undergo aldol condensation and give respective aldol.