Which of the following named reaction is not used for introducing a - COOH group ?

Options

A. Cannizzaro reaction
B. Benzylic acid rearrangement
C. lodoform reaction
D. none of these

Answer

To solve the question, we need to analyze the named reactions provided and determine which one does not introduce a carboxylic acid group (-COOH).

### Step-by-Step Solution:

1. **Identify the Reactions**: The reactions mentioned in the question are:
- Canizzaro Reaction
- Benzylic Acid Rearrangement
- Iodoform Reaction

2. **Analyze Each Reaction**:
- **Canizzaro Reaction**: This reaction involves the disproportionation of aldehydes without alpha-hydrogens. It produces a carboxylic acid and an alcohol. Thus, it introduces a -COOH group.
- **Benzylic Acid Rearrangement**: This reaction involves the rearrangement of certain compounds to yield benzoic acid. It also introduces a -COOH group.
- **Iodoform Reaction**: This reaction is used to identify methyl ketones and results in the formation of iodoform (CHI3) and a carboxylic acid. Therefore, it introduces a -COOH group as well.

3. **Identify the Reaction Not Introducing -COOH**:
- Since all three reactions mentioned (Canizzaro, Benzylic Acid Rearrangement, and Iodoform Reaction) are known to introduce a -COOH group, we need to find a reaction that does not.
- **Baeyer-Villiger Oxidation**: This reaction converts ketones into esters or lactones through the action of peracids. It does not introduce a -COOH group.

4. **Conclusion**: Since the question asks for the reaction that does not introduce a -COOH group, and all the listed reactions do, the answer should be that none of these reactions are correct for introducing a -COOH group. Thus, the answer is option B.

### Final Answer:
None of these reactions are used for introducing a -COOH group.

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