What type of aldehydes and ketones undergo aldol condensation?

Explanation

To determine what type of aldehydes and ketones undergo aldol condensation, we can follow these steps:

### Step 1: Understand Aldol Condensation
Aldol condensation is a reaction that involves the formation of a β-hydroxy aldehyde or ketone (aldol) from the reaction of two carbonyl compounds, typically aldehydes or ketones, in the presence of a base. The reaction proceeds through the formation of an enolate ion from one of the carbonyl compounds.

### Step 2: Identify the Requirement for Aldol Condensation
For an aldehyde or ketone to undergo aldol condensation, it must have at least one alpha hydrogen atom. The alpha hydrogen is the hydrogen atom attached to the carbon adjacent to the carbonyl group (C=O). This hydrogen is essential for the formation of the enolate ion.

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