Convert Ethanol to But-1-yne.

Explanation

To convert ethanol (C2H5OH) to but-1-yne (C4H6), we can follow these steps:

### Step 1: Dehydration of Ethanol to Ethene
- **Reaction**: Ethanol is treated with aluminum oxide (Al2O3) to undergo dehydration.
- **Equation**:
\[ \text{C}_2\text{H}_5\text{OH} \xrightarrow{\text{Al}_2\text{O}_3} \text{C}_2\text{H}_4 + \text{H}_2\text{O} \]
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