Which compound is treated with KCN to get butane nitrile ?

Explanation

To determine which compound is treated with KCN to yield butane nitrile, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Butane Nitrile**:
- Butane nitrile has the molecular formula C4H7N and can be represented as CH3-CH2-CH2-C≡N. This indicates that butane nitrile consists of four carbon atoms and a nitrile functional group (C≡N).

2. **Understand the Reaction Mechanism**:
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