Assertion. Calcium carbide on hydrolysis gives ethylene
Reason. Calcium carbide contains `C^(4-)` anions

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion 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 1: Understand the Assertion
The assertion states that calcium carbide on hydrolysis gives ethylene. Calcium carbide (CaC2) is a compound that consists of calcium ions (Ca²⁺) and carbide ions (C2²⁻). When calcium carbide undergoes hydrolysis, it reacts with water.

### Step 2: Hydrolysis of Calcium Carbide
When calcium carbide is hydrolyzed, the reaction can be represented as:
\[ \text{CaC}_2 + 2 \text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_2 + \text{Ca(OH)}_2 \]
Here, calcium carbide reacts with water to produce acetylene (C2H2), not ethylene (C2H4). Therefore, the assertion that calcium carbide gives ethylene upon hydrolysis is incorrect.

### Step 3: Understand the Reason
The reason states that calcium carbide contains C^(4-) anions. However, this is also incorrect. Calcium carbide contains C2²⁻ (carbide ions), which is a divalent anion, not C^(4-).

### Step 4: Conclusion
Both the assertion and the reason are incorrect. Therefore, the correct answer to the question is that both the assertion and the reason are false.

### Final Answer
- **Assertion**: False (Calcium carbide gives acetylene, not ethylene)
- **Reason**: False (Calcium carbide contains C2²⁻, not C^(4-))