Which of the following reaction does not involve a `C-C` bond formation?

Options

A. Hydrolysis of a Grignard reagent
B. Combination of two alkyl free radicals
C. Corey-House synthesis of alkanes
D. `RN a+R-BrtoR-R+NaBr`

Explanation

To determine which of the given reactions does not involve a C-C bond formation, let's analyze each option step by step.

### Step 1: Understand the Reactions
1. **Hydrolysis of a Grignard Reagent**: A Grignard reagent is an organomagnesium compound represented as R-MgX. When it undergoes hydrolysis with water (H₂O), it produces an alkane (R-H) and a magnesium hydroxide halide (Mg(OH)X).

2. **Combination of Two Alkyl Free Radicals**: In this reaction, two alkyl radicals (R•) combine to form a new alkane (R-R). This reaction clearly involves the formation of a new C-C bond.

3. **Cori-House Synthesis of Alkanes**: This reaction involves lithium dialkylcuprate (R₂CuLi) reacting with an alkyl halide (R-X) to produce a new alkane (R-R) and an organic copper compound. Again, this involves the formation of a new C-C bond.

4. **Reaction of Alkyl Halides**: In this reaction, two alkyl halides (R-X) react to form a new alkane (R-R) through a coupling mechanism. This also results in the formation of a new C-C bond.

### Step 2: Identify the Reaction without C-C Bond Formation
- **Hydrolysis of a Grignard Reagent**: In this reaction, the Grignard reagent reacts with water to produce an alkane and does not form any new C-C bonds. The alkane is formed by protonation of the nucleophile (R), but no new carbon-carbon bond is created.

### Conclusion
The reaction that does not involve a C-C bond formation is the **hydrolysis of a Grignard reagent**.

### Final Answer
**Option A: Hydrolysis of a Grignard Reagent does not involve a C-C bond formation.**

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