Explain the following reaction :
`n-BuBr+KCN overset(EtOH-H_(2)O)to n-BuCN`

Explanation

To explain the reaction of n-butyl bromide with potassium cyanide (KCN) in the presence of ethanol and water to form n-butyl cyanide, we can break it down into several steps:

### Step-by-Step Explanation:

1. **Identify the Reactants**:
- The reactants in this reaction are n-butyl bromide (n-BuBr) and potassium cyanide (KCN). n-Butyl bromide has the structure CH3-CH2-CH2-CH2Br, which consists of a straight-chain four-carbon alkane with a bromine atom attached to the terminal carbon.

2. **Structure of Potassium Cyanide**:
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