In which of the following reactions new carbon-carbon bond is not formed

Options

A. Cannizzaro reaction
B. Wurtz reaction
C. Aldol condensation
D. Friedel-Crafts reaction

Explanation

To determine in which of the following reactions a new carbon-carbon bond is not formed, we will analyze each reaction mentioned in the video transcript.

### Step-by-Step Solution:

1. **Identify the Reactions**:
- The reactions mentioned are:
1. Canizaro Reaction
2. Uracil Reaction (likely a typo for Urea Reaction)
3. Aldol Condensation
4. Friedel-Crafts Reaction

2. **Analyze Each Reaction**:
- **Canizaro Reaction**:
- This reaction involves the disproportionation of non-enolizable aldehydes in the presence of a strong base. No new carbon-carbon bonds are formed; instead, one aldehyde molecule is oxidized to a carboxylic acid, and another is reduced to an alcohol.
- **Conclusion**: No new C-C bond is formed.

- **Urea Reaction** (assuming this refers to a reaction involving urea or similar):
- This typically involves the formation of new carbon bonds through dimerization or other reactions. If it involves the formation of urea derivatives, new C-C bonds may be formed.
- **Conclusion**: New C-C bonds are likely formed.

- **Aldol Condensation**:
- This reaction involves the reaction of aldehydes or ketones to form β-hydroxy aldehydes or ketones. The enolate ion of one carbonyl compound attacks the carbonyl carbon of another, forming a new C-C bond.
- **Conclusion**: New C-C bonds are formed.

- **Friedel-Crafts Reaction**:
- This is an electrophilic aromatic substitution reaction where an alkyl or acyl group is introduced into an aromatic ring. This process involves the formation of new C-C bonds as the alkyl group attaches to the benzene ring.
- **Conclusion**: New C-C bonds are formed.

3. **Final Answer**:
- The only reaction where no new carbon-carbon bond is formed is the **Canizaro Reaction**.

### Summary:
The reaction in which a new carbon-carbon bond is not formed is the **Canizaro Reaction**.