Coupling reaction between `RMgX` and `R'X` takes place to give `R-R'` in the presence of which of the following reagents ?

Options

A. `R' - OT s`
B. `CoCl_2`
C. `MnCl_2`
D. All

Explanation

To determine which reagents facilitate the coupling reaction between RMgX (Grignard reagent) and R'X (alkyl halide) to produce R-R' (an alkane), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reaction**:
- The coupling reaction involves a Grignard reagent (RMgX) reacting with an alkyl halide (R'X) to form an alkane (R-R').
- In this reaction, RMgX acts as a nucleophile, while R'X acts as an electrophile.

2. **Identify the Role of Catalysts**:
- The coupling reaction typically requires a metal catalyst to proceed effectively. Common catalysts include nickel (Ni), manganese (Mn), and cobalt (Co).
- These metals facilitate the coupling process by helping to activate the halide and stabilize the intermediates formed during the reaction.

3. **Consider the Options**:
- The question asks which of the following reagents can be used for this coupling reaction. The options provided likely include various metal catalysts.
- Since the reaction can proceed with any of the mentioned metals, we need to evaluate if all options are valid.

4. **Conclusion**:
- Since the coupling reaction can be catalyzed by nickel, manganese, cobalt, and possibly other transition metals, the answer is that all of the listed compounds can be used to perform this coupling reaction.
- Therefore, the correct answer is **option D: all of the compounds**.