Convert benzene to 1-bromo-3 - ethybenzene

Explanation

To convert benzene to 1-bromo-3-ethylbenzene, we will follow a series of steps involving electrophilic aromatic substitution reactions. Here’s a step-by-step breakdown of the process:

### Step 1: Friedel-Crafts Acylation
1. **Reaction Setup**: Start with benzene (C6H6) and an acyl chloride (for example, propanoyl chloride, CH3C(O)Cl).
2. **Reagents**: Use anhydrous aluminum chloride (AlCl3) as a Lewis acid catalyst.
3. **Mechanism**:
- The acyl chloride reacts with AlCl3 to form an acylium ion (C6H5C^+=O).
- This acylium ion acts as an electrophile and attacks the benzene ring, replacing one hydrogen atom.
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