Condensation And Evaporation

Aldol condensation is a reaction involving the enolate ion of an aldehyde or a ketone with a carbonyl compound to form a β-hydroxy aldehyde or β-hydroxy ketone followed by dehydration to give a conjugated enone. For a compound to undergo Aldol condensation, it must possess α-hydrogen atoms. Let's analyze the options:

1. Compound (A): It has α-hydrogens, thus capable of forming an enolate ion and can undergo Aldol condensation.
2. Compound (B): Lacks α-hydrogens, thus cannot form an enolate ion, meaning it can't participate in Aldol condensation.
3. Compound (C): Contains α-hydrogens, so it can form an enolate ion and undergo Aldol condensation.
4. Compound (D): Also has α-hydrogens, enabling it to undergo Aldol condensation.

Therefore, the compounds that can undergo Aldol condensation are (A), (C), and (D).