Tert-Butyl bromide is treated with sodium metal in dry ether.

Explanation

To solve the problem of what happens when tert-butyl bromide is treated with sodium metal in dry ether, we can follow these steps:

### Step 1: Identify the Reactants
The reactant in this case is tert-butyl bromide, which has the structure:
\[ \text{(CH}_3\text{)}_3\text{CBr} \]
This means it has three methyl groups attached to a central carbon atom, which is also bonded to a bromine atom.

### Step 2: Understand the Reaction Conditions
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