Cannizzaro's reaction is not given by

Options

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

Explanation

To determine which compound does not undergo Cannizzaro's reaction, we need to understand the conditions required for this reaction to occur.

### Step-by-Step Solution:

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

2. **Identify the Requirement**:
- The key requirement for Cannizzaro's reaction is that the aldehyde must not have any alpha hydrogen atoms. Alpha hydrogens are the hydrogen atoms attached to the carbon atom adjacent to the carbonyl carbon.

3. **Analyze Given Compounds**:
- We need to analyze the compounds provided in the options to check for the presence of alpha hydrogen.
- For example, consider the compound CH3CHO (acetaldehyde). This compound has alpha hydrogen atoms (the CH3 group has three hydrogens), so it can undergo Cannizzaro's reaction.
- In contrast, if we consider a compound like formaldehyde (HCHO), it has no alpha hydrogen and can undergo Cannizzaro's reaction.

4. **Identify the Correct Option**:
- Based on the analysis, we look for an aldehyde that does not have any alpha hydrogen.
- If we find an option that contains an aldehyde with alpha hydrogen, that option cannot undergo Cannizzaro's reaction.

5. **Conclusion**:
- After evaluating the options, we conclude that the compound which does not undergo Cannizzaro's reaction is the one that has alpha hydrogen atoms present.

### Final Answer:
- The correct option that does not undergo Cannizzaro's reaction is **Option C**.