Assertion : Among `SiCl_4` and `C Cl_4` only `SiCl_4` reacts with water.
Reason : `SiCl_4` is ionic and `C Cl_4` is covalent .

Options

A. If both Assertion and Reason are correct and Reason is the Correct explanation of the Assertion.
B. If both Assertion and Reason are Correct but Reason is not the Correct explanation of the Assertion.
C. If Assertion is Correct but Reason is Incorrect
D. If Assertion is incorrect but Reason is Correct

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that among SiCl₄ and CCl₄, only SiCl₄ reacts with water.
- This is true. SiCl₄ (silicon tetrachloride) reacts with water to form orthosilicic acid (H₄SiO₄) and hydrochloric acid (HCl).

2. **Chemical Reaction**:
- The reaction of SiCl₄ with water can be represented as:
\[ \text{SiCl}_4 + 2 \text{H}_2\text{O} \rightarrow \text{H}_4\text{SiO}_4 + 4 \text{HCl} \]
- This shows that SiCl₄ undergoes hydrolysis.

3. **Understanding the Reason**:
- The reason provided states that SiCl₄ is ionic and CCl₄ is covalent.
- This statement is incorrect. Both SiCl₄ and CCl₄ are covalent compounds.

4. **Properties of SiCl₄**:
- SiCl₄ can hydrolyze due to the presence of d-orbitals in silicon, which allows it to expand its covalency and react with water.
- The ability to hydrolyze is not due to being ionic but rather due to the nature of silicon and its bonding.

5. **Properties of CCl₄**:
- CCl₄ (carbon tetrachloride) does not react with water because it is a stable covalent compound and does not have the ability to hydrolyze like SiCl₄.

6. **Conclusion**:
- The assertion is correct, but the reason is incorrect. Therefore, the correct option is:
- Option C: Assertion is correct, but reason is incorrect.