Gattermann Reaction

Explanation

### Step-by-Step Solution for Gattermann Reaction

**Step 1: Understanding the Gattermann Reaction**
The Gattermann reaction is a method used to introduce an aldehyde group into a benzene ring. There are two types of Gattermann reactions: the Gattermann-Koch reaction and the Gattermann aldehyde reaction.

**Step 2: Gattermann-Koch Reaction**
- **Reactants**: Benzene (C6H6), Carbon monoxide (CO), Hydrochloric acid (HCl), and Aluminum chloride (AlCl3).
- **Process**:
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