For the preparation of n-propylbenzene 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. Let's analyze the reactions step by step.

### Step 1: Understanding the target compound
We need to prepare n-propylbenzene, which consists of a benzene ring with a propyl group (C3H7) attached to it.

### Step 2: Analyzing the options
1. **Wurtz Reaction**: This reaction involves the coupling of alkyl halides using sodium metal.
- For example: 2 R-X + 2 Na → R-R + 2 NaX
- In this case, if we take chlorobenzene (C6H5Cl) and n-propyl chloride (C3H7Cl), we can couple them to form n-propylbenzene (C6H5C3H7) without rearrangement.

2. **Grignard Reaction**: Grignard reagents react with carbonyl compounds and cannot be used for electrophilic substitution on benzene. Thus, this is not suitable for our purpose.

3. **Friedel-Crafts Alkylation**: This involves the alkylation of benzene using alkyl halides in the presence of a Lewis acid (like AlCl3). However, this reaction can lead to rearrangement of the alkyl group (for example, n-propyl can rearrange to isopropyl), making it unsuitable for forming n-propylbenzene.

4. **Wurtz-Fitting Reaction**: Similar to the Wurtz reaction, this involves the coupling of an aryl halide with an alkyl halide using sodium. It is suitable for forming aryl-alkyl compounds without rearrangement.

### Step 3: Conclusion
The most suitable reaction for the preparation of n-propylbenzene is the **Wurtz-Fitting Reaction**. This reaction allows us to couple chlorobenzene with n-propyl chloride using sodium, yielding n-propylbenzene without rearrangement.

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

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