For the preparation of n-propylbenezene which of the following reactions is most suitable?

Options

A. Wurtz-fittig reaction
B. Wurtz reaction
C. Friedel-Crafts alkylation
D. Grignard reaction

Explanation

To prepare n-propylbenzene, we need to identify the most suitable reaction from the given options. The goal is to combine a propyl group with a benzene ring without rearranging to form isopropylbenzene.

### Step-by-Step Solution:

1. **Identify the Structure of n-Propylbenzene**:
n-Propylbenzene consists of a benzene ring attached to a straight-chain propyl group (C3H7). The structure can be represented as C6H5-CH2-CH2-CH3.

2. **Review the Reaction Options**:
We need to evaluate the reactions provided in the options. The most common reactions for alkylation of benzene are Friedel-Crafts alkylation and Wurtz reaction.

3. **Evaluate Friedel-Crafts Alkylation**:
- In Friedel-Crafts alkylation, benzene reacts with an alkyl halide in the presence of a Lewis acid catalyst (like AlCl3).
- If we use isopropyl bromide (or chloride) as the alkyl halide, the reaction can lead to the formation of isopropylbenzene due to carbocation rearrangement. This is not what we want since we need n-propylbenzene.

4. **Evaluate Wurtz Reaction**:
- The Wurtz reaction involves the coupling of two alkyl halides in the presence of sodium metal (Na) to form a higher alkane.
- If we take n-propyl bromide (C3H7Br) and react it with sodium, we can couple two n-propyl groups to form n-propylbenzene without rearrangement.

5. **Conclusion**:
The most suitable reaction for the preparation of n-propylbenzene is the Wurtz reaction. This reaction allows us to combine the n-propyl groups without the risk of rearrangement that occurs in Friedel-Crafts alkylation.

### Final Answer:
The most suitable reaction for the preparation of n-propylbenzene is the **Wurtz reaction**.

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