| 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
E) 5 only
Correct Answer: D
Solution :
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, methanol though does not contain \[\alpha -\]hydrogen atom yet undergoes cross aldol condensation in the presence of limewater. Thus, aldehydes that do not undergo aldol condensation are trichloroethanal, benzaldehyde and methanal.
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