Electrolysis of solution gives acetylene gas

Explanation

To solve the question regarding the electrolysis of a solution that gives acetylene gas, we will analyze the electrolysis of different compounds step by step.

### Step-by-Step Solution:

1. **Understanding Electrolysis**:
- Electrolysis involves the breakdown of a compound into its components using an electric current. The anode is positively charged, attracting anions (negatively charged ions), while the cathode is negatively charged, attracting cations (positively charged ions).

2. **Analyzing Sodium Fumarate**:
- Sodium fumarate has the structure: Na+ - COO^- (trans configuration).
- During electrolysis, the COO^- (fumarate ion) moves to the anode where it undergoes oxidation.
- The oxidation process leads to the release of two electrons and the formation of a radical.
- As a result of decarboxylation, CO2 gas is released, and we end up with acetylene (C2H2) as the final product.

3. **Analyzing Sodium Malate**:
- Sodium malate has a similar structure to sodium fumarate but with the COO^- groups in a cis configuration.
- Upon electrolysis, the malate ion also moves to the anode and undergoes oxidation.
- This process similarly releases two electrons and forms a radical.
- Decarboxylation occurs, releasing CO2 gas, and we again produce acetylene gas.

4. **Analyzing Sodium Succinate**:
- Sodium succinate has the structure: CH2COO^- - Na+.
- The succinate ion moves to the anode and undergoes oxidation.
- This results in the removal of two electrons and the formation of a radical.
- However, instead of forming acetylene, the radicals combine to produce ethane (C2H6) after the release of CO2.

5. **Conclusion**:
- From the analysis, we find that acetylene gas is produced from the electrolysis of sodium fumarate and sodium malate.
- Therefore, the correct answer is that acetylene gas is obtained from both sodium fumarate and sodium malate.

### Final Answer:
Acetylene gas is produced from the electrolysis of sodium fumarate and sodium malate.