How 3-hexyne can be prepared form acetylene?

Explanation

To prepare 3-hexyne from acetylene, we can follow these steps:

### Step 1: Formation of Sodium Acetylide
Start with acetylene (C2H2), which has the structure H-C≡C-H. When acetylene reacts with sodium metal (Na), it forms sodium acetylide. The reaction can be represented as follows:

\[ 2 \text{C}_2\text{H}_2 + 2 \text{Na} \rightarrow 2 \text{Na}^+ \text{C} \equiv \text{C}^- + \text{H}_2 \]
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