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Question:

Aldol condensation between which of the following two compounds followed by dehydration gives methyl vinyl ketone?

Formaldehyde and acetone

Formaldehyde and acetaldehyde

Two molecules of acetone

Two molecules of acetaldehyde

Solution:

Aldol condensation of formaldehyde and acetone gives CH₂O + CH₃COCH₃ → HOCH₂-CH₂-CO-CH₃
Heating the product gives methyl vinyl ketone.
HOCH₂-CH₂-CO-CH₃ Δ → CH₂=CH-CO-CH₃