How will you convert acetaldehyde into the following compounds ?
Butane-1,3-diol

Explanation

To convert acetaldehyde (CH3CHO) into butane-1,3-diol (CH3-CHOH-CHOH-CH2OH), we can follow these steps:

### Step 1: Aldol Condensation
1. **React Acetaldehyde with Dilute NaOH**:
- When acetaldehyde is treated with dilute sodium hydroxide (NaOH), it undergoes aldol condensation.
- In this reaction, two molecules of acetaldehyde react to form a β-hydroxy aldehyde (3-hydroxybutanal).
- The reaction can be represented as:
\[
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