Convert 1 - bromobutane to
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-CHO`

Explanation

To convert 1-bromobutane to pentanal (CH₃-CH₂-CH₂-CH₂-CHO), we can follow these steps:

### Step 1: Nucleophilic Substitution with Sodium Ethylate
1. **React 1-bromobutane with sodium ethylate (C₂H₅Na)**.
- This reaction will result in the formation of a new carbon-carbon bond.
- The bromine atom will leave, and the ethyl group will attach to the butane chain.
- The reaction can be represented as:
\[
...