Question

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

• A. 1, 2 and 3 are correct
• B. 1 and 2 are correct
• C. 2 and 4 are correct
• D. 1 and 3 are correct

Answer 1

Answer: (A)

Carbonyl compounds having atleast one $\alpha -H$ atom are able to undergo aldol condensation.
The structures of the given compounds are as

Thus, acetaldehyde, propionaldehyde and trideutero acetaldehyde undergo aldol condensation and give respective aldol.