The Cannizzaro's reaction is not give by:

Options

A. Trimethyl acetaldehyde
B. Acetaldehyde
C. Benzaldehyde
D. Formaldehyde

Explanation

To solve the question regarding the Cannizzaro reaction and identify which compound does not undergo this reaction, we can follow these steps:

### Step 1: Understand the 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.

**Hint:** Remember that the presence of alpha-hydrogens is crucial for determining whether a compound can participate in the Cannizzaro reaction.

### Step 2: Identify the Compounds
We need to analyze the given options to see which compound does not have alpha-hydrogens. The options are:
1. Trimethylacetaldehyde
2. Acetaldehyde
3. Benzaldehyde
4. Formaldehyde

**Hint:** Look for the structure of each compound to identify the presence or absence of alpha-hydrogens.

### Step 3: Analyze Each Compound
1. **Trimethylacetaldehyde (C(CH3)3CHO)**: This compound has three methyl groups attached to the carbon adjacent to the carbonyl group. Therefore, it does not have any alpha-hydrogens.

2. **Acetaldehyde (CH3CHO)**: This compound has one alpha-hydrogen (the hydrogen on the methyl group). Therefore, it can participate in the Cannizzaro reaction.

3. **Benzaldehyde (C6H5CHO)**: This compound has no alpha-hydrogens because the carbonyl carbon is directly attached to a benzene ring. Thus, it can also undergo the Cannizzaro reaction.

4. **Formaldehyde (HCHO)**: This compound has no alpha-hydrogens and can participate in the Cannizzaro reaction.

**Hint:** For each compound, check if the carbon adjacent to the carbonyl group has any hydrogen atoms.

### Step 4: Conclusion
Based on the analysis:
- Trimethylacetaldehyde has no alpha-hydrogens and can undergo the Cannizzaro reaction.
- Acetaldehyde has alpha-hydrogens and can undergo the Cannizzaro reaction.
- Benzaldehyde has no alpha-hydrogens and can undergo the Cannizzaro reaction.
- Formaldehyde has no alpha-hydrogens and can undergo the Cannizzaro reaction.

The only compound that does not undergo the Cannizzaro reaction is **Acetaldehyde**.

### Final Answer
The Cannizzaro reaction is not given by: **Acetaldehyde** (Option 2).