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Aldehydes that do not undergo aldol cond...

Aldehydes that do not undergo aldol condensation are
1. propanal 2. trichloroethanal
3. methanal 4. ethanal
5. benzaldehyde

A

3 and 4 only

B

3 and 5 only

C

1, 2 and 3 only

D

2, 3 and 5 only

Text Solution

Verified by Experts

The correct Answer is:
D
The carbonyl compounds must contain an `alpha`-hydrogen atom to undergo aldol condensation. Thus, propanal and ethanal are the aldehydes that can undergo aldol condensation.
However, methanal though does not contain `alpha`-hydrogen atom yet undergoes cross aldol codensation in the presence of limewater.
Thus, aldehydes that do not undergo aldol condensation are trichloroethanal, benzaldehyde and methanal.
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