Which compound is treated with KCN to get butane nitrile ?

Explanation

To determine which compound is treated with KCN to obtain butane nitrile, we need to analyze the structure of butane nitrile and the reaction involved.

### Step-by-Step Solution:

1. **Identify the Structure of Butane Nitrile**:
- Butane nitrile, also known as butyronitrile, has the chemical formula C4H7N. It consists of a four-carbon chain (butane) with a nitrile group (-C≡N) attached to one end.

2. **Understanding the Reaction**:
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