Complete the following equation:
` ArN_(2)^(+) X^(-) +CN^(-) overset(CuCN) to ……... +N_2 +X^(-)`

Explanation

To complete the given equation, we will follow the steps involved in the Sandmeyer reaction, which is a nucleophilic substitution reaction involving a diazonium compound.

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in the equation are:
- Aryl diazonium salt: \( \text{ArN}_2^+ \text{X}^- \)
- Cyanide ion: \( \text{CN}^- \)
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