Write the structure of an isomer of compound `C_(4)H_(9)Br` which is most reactive towards `S_(N)1` reaction.

Explanation

To find the structure of an isomer of the compound \( C_4H_9Br \) that is most reactive towards \( S_N1 \) reactions, we will follow these steps:

### Step 1: Identify the possible isomers of \( C_4H_9Br \)

The molecular formula \( C_4H_9Br \) indicates that we have a brominated alkane with four carbon atoms. The possible structural isomers of butane \( (C_4H_{10}) \) can be:

1. **Butyl bromide (1-bromobutane)**:
- Structure: \( CH_3-CH_2-CH_2-CH_2Br \)
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