Cannizzaro reaction does not take place with

Options

A. `(CH_(3))_(3)C CHO`
B.
C.
D. `CH_(3)CHO`

Explanation

To determine which compound does not undergo the Cannizzaro reaction, we first need to understand the conditions under which this reaction occurs.

### Step-by-Step Solution:

1. **Understanding the Cannizzaro Reaction**:
- The Cannizzaro reaction is a redox reaction that occurs in aldehydes that lack alpha hydrogen atoms. In this reaction, one molecule of aldehyde is oxidized to a carboxylic acid, while another molecule is reduced to an alcohol.

2. **Identifying Aldehydes**:
- Aldehydes are compounds with the functional group -CHO. The general structure can be represented as RCHO, where R is a hydrocarbon group.

3. **Alpha Hydrogen Concept**:
- Alpha hydrogens are the hydrogen atoms attached to the carbon adjacent to the carbonyl carbon (C=O). For the Cannizzaro reaction to occur, the aldehyde must not have any alpha hydrogens.

4. **Examples of Aldehydes**:
- Formaldehyde (HCHO) and benzaldehyde (C6H5CHO) are examples of aldehydes that do not have alpha hydrogens and can undergo the Cannizzaro reaction.
- On the other hand, acetaldehyde (CH3CHO) has alpha hydrogens (the three hydrogens on the methyl group) and therefore does not undergo the Cannizzaro reaction.

5. **Conclusion**:
- The compound that does not undergo the Cannizzaro reaction is acetaldehyde (CH3CHO) due to the presence of alpha hydrogens.

### Final Answer:
**Acetaldehyde (CH3CHO) does not undergo the Cannizzaro reaction.**