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 structural characteristics of both compounds and the requirements for Cannizzaro's reaction.

### Step-by-Step Solution:

1. **Definition of Cannizzaro's Reaction**:
Cannizzaro's reaction is a redox reaction that occurs with aldehydes lacking 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. **Structure of Formaldehyde**:
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