A new C-C bond is formed in-

Options

A. (a)Cannizzaro reaction
B. (b)Friedel Crafts reaction
C. (c)Both A `&` B
D. (d)None of these

Answer

To solve the question "A new C-C bond is formed in-", we need to analyze the given options: Kenny's arrow reaction, Friedel-Craft reaction, Both A and B, and None of these.

### Step-by-Step Solution:

1. **Understanding Kenny's Arrow Reaction**:
- In Kenny's arrow reaction, an aldehyde reacts with a base (OH-).
- The hydroxide ion (OH-) attacks the carbon of the aldehyde, forming an intermediate.
- This intermediate can react with another aldehyde to produce carboxylic acid and primary alcohol.
- **Conclusion**: In this process, no new carbon-carbon (C-C) bond is formed.

2. **Understanding Friedel-Crafts Reaction**:
- In the Friedel-Crafts reaction, an alkyl halide (e.g., RCl) reacts with a Lewis acid (e.g., FeCl3).
- This reaction generates a carbocation (R+) from the alkyl halide.
- The carbocation then reacts with benzene, resulting in the formation of an alkyl-substituted benzene.
- **Conclusion**: This process involves the formation of a new carbon-carbon (C-C) bond between the alkyl group and the benzene ring.

3. **Evaluating the Options**:
- **Option A (Kenny's Arrow Reaction)**: No C-C bond is formed.
- **Option B (Friedel-Crafts Reaction)**: A new C-C bond is formed.
- **Option C (Both A and B)**: This is incorrect since Kenny's arrow does not form a C-C bond.
- **Option D (None of these)**: This is also incorrect since Friedel-Crafts does form a C-C bond.

4. **Final Answer**:
- The correct answer is **B (Friedel-Crafts reaction)**, as it is the only reaction among the options that results in the formation of a new carbon-carbon bond.