aldol condensation

Question

Aldol condensation requires:

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The **Aldol Condensation** is a crucial C-C bond-forming reaction.
- **Requirement**: An aldehyde or ketone must possess at least one **$\alpha$-hydrogen** atom.
- **Mechanism**: A base (like dilute $NaOH$) abstracts the acidic $\alpha$-hydrogen to form a resonance-stabilized **enolate ion**. This ion then acts as a nucleophile, attacking the carbonyl carbon of another molecule.
- Product: A $\beta$-hydroxy aldehyde (Aldol) or $\beta$-hydroxy ketone, which often dehydrates on heating to form an $\alpha,\beta$-unsaturated carbonyl compound.

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Aldol condensation requires compounds possessing: