Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the chief product. Explain.

Explanation

To explain why haloalkanes react with KCN to form alkyl cyanides as the main product, while AgCN forms isocyanides as the chief product, we can break down the reaction mechanisms involved with each reagent.

### Step-by-Step Solution:

1. **Understanding the Reactants:**
- Haloalkanes have the general formula R-X, where R is an alkyl group and X is a halogen (the leaving group).
- KCN (Potassium cyanide) is an ionic compound, while AgCN (Silver cyanide) is a covalent compound.

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