Assertion (A) : `SnCl_2` has high meling point , whereas `snCl_4` has low melting point .
Reason (R) : ` SnCl_4` has ionic nature whereas `SnCl_4` is covalent compound invloving `sp^3` hyvdridsation .

Options

A. If both (A) and (R) are correct and (R) is correct explanation of (A)
B. If both (A) and (R) are correct and (R) is correct explanation of (A)
C. If (A) is correct , but (R) is incorrect
D. If (A) is incorrect but (R) is correct .

Answer

To solve the question, we need to analyze the assertion and reason provided regarding the compounds SnCl2 and SnCl4.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that SnCl2 has a high melting point, while SnCl4 has a low melting point.
- To evaluate this, we need to consider the nature of the bonding in these compounds.

2. **Analyzing the Nature of Bonds**:
- SnCl2 is known to have an ionic character due to the lower oxidation state of Sn (+2). Ionic compounds typically have higher melting points due to the strong electrostatic forces between the cations and anions.
- SnCl4, on the other hand, has a higher oxidation state of Sn (+4) and exhibits more covalent character. This is because the higher charge on the Sn cation increases its polarizing power, leading to a greater distortion of the electron cloud of the anions (Cl-), resulting in covalent character.

3. **Comparing Melting Points**:
- Since ionic bonds are generally stronger than covalent bonds, SnCl2, which is more ionic, will have a higher melting point compared to SnCl4, which is more covalent.
- Therefore, the assertion that SnCl2 has a high melting point and SnCl4 has a low melting point is correct.

4. **Understanding the Reason**:
- The reason states that SnCl4 has ionic nature, whereas SnCl2 is a covalent compound involving sp3 hybridization.
- This statement is incorrect. SnCl4 is primarily covalent due to its higher oxidation state and sp3 hybridization, while SnCl2 is more ionic in nature.

5. **Conclusion**:
- The assertion is true, but the reason is incorrect. Therefore, the correct conclusion is that the assertion is correct, but the reason does not accurately explain the assertion.

### Final Answer:
- **Assertion (A)**: True
- **Reason (R)**: False
- Therefore, the answer is that A is correct, but R is not a correct explanation of A.