Assertion: Haloalkanes react with KCN to form alkyl cyanides as main product while with AgCN form isocyanide as the main product.
Reason: KCN and AgCN, both are ionic compounds.

Options

A. If both assertion and reason are true and reason Is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assetion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that haloalkanes react with KCN to form alkyl cyanides as the main product, and with AgCN, they form isocyanides as the main product.
- When a haloalkane (RX) reacts with KCN, the cyanide ion (CN⁻) acts as a nucleophile and attacks the carbon atom bonded to the leaving group (X). This results in the formation of an alkyl cyanide (RCN).
- The reaction can be represented as:
\[ RX + KCN \rightarrow RCN + KX \]
- When the same haloalkane reacts with AgCN, the nitrogen in the cyanide ion (which is part of AgCN) has a lone pair that can attack the carbon. This leads to the formation of isocyanide (RNC):
\[ RX + AgCN \rightarrow RNC + AgX \]

2. **Understanding the Reason**:
- The reason states that KCN and AgCN are both ionic compounds.
- KCN is indeed an ionic compound as it dissociates into K⁺ and CN⁻ ions in solution.
- However, AgCN is not purely ionic; it has covalent character due to the nature of the bond between Ag and CN. Thus, this statement is incorrect.

3. **Conclusion**:
- The assertion is true because it correctly describes the reactions of haloalkanes with KCN and AgCN.
- The reason is false because it incorrectly categorizes AgCN as an ionic compound.

### Final Answer:
- The assertion is true, but the reason is false. Therefore, the correct option is **C**.