Formaldehyde gives Cannizzaro's reaction while acetaldehyde does not. Why ?

Explanation

To understand why formaldehyde undergoes Cannizzaro's reaction while acetaldehyde does not, we need to analyze the conditions required for the Cannizzaro reaction and the structures of both compounds.

### Step-by-Step Solution:

1. **Definition of Cannizzaro Reaction**:
The Cannizzaro reaction is a redox reaction that occurs in aldehydes that do not have alpha hydrogens. In this reaction, one molecule of the aldehyde is oxidized to a carboxylic acid, while another molecule is reduced to an alcohol.

2. **Identifying Alpha Hydrogen**:
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