Aqueous solution of the following compounds are electrolysed . Acetylene gas is obtained from

Options

A. sodium fumarate
B. sodium maleate
C. sodium succinate
D. both A and B

Answer

To determine which aqueous compound produces acetylene gas (C2H2) upon electrolysis, we will analyze the electrolysis process for each compound mentioned in the question.

### Step-by-Step Solution:

1. **Understanding Acetylene Formation**:
Acetylene (C2H2) is formed through the electrolysis of compounds that can yield carbon atoms in a way that allows for the formation of a triple bond between them.

2. **Analyzing Sodium Fumarate**:
- The structure of sodium fumarate is represented as:
\[ \text{HOOC-CH=CH-COONa} \]
- Upon electrolysis, the double bonds can break, and the carbon atoms can rearrange to form acetylene:
\[ \text{Electrolysis: HOOC-CH=CH-COONa} \rightarrow \text{C2H2 (acetylene) + CO2 + Na+} \]
- Thus, sodium fumarate can produce acetylene.

3. **Analyzing Sodium Malate**:
- The structure of sodium malate is similar to fumarate:
\[ \text{HOOC-CH(OH)-CH=COONa} \]
- During electrolysis, similar rearrangements can occur, leading to the formation of acetylene:
\[ \text{Electrolysis: HOOC-CH(OH)-CH=COONa} \rightarrow \text{C2H2 (acetylene) + CO2 + Na+} \]
- Therefore, sodium malate can also produce acetylene.

4. **Analyzing Sodium Succinate**:
- The structure of sodium succinate is:
\[ \text{HOOC-CH2-CH2-COONa} \]
- Upon electrolysis, the structure does not allow for the formation of a triple bond:
\[ \text{Electrolysis: HOOC-CH2-CH2-COONa} \rightarrow \text{CH2=CH2 (ethylene) + CO2 + Na+} \]
- Thus, sodium succinate does not produce acetylene.

5. **Conclusion**:
- From the analysis, sodium fumarate and sodium malate can produce acetylene gas upon electrolysis, while sodium succinate cannot.
- Therefore, the correct answer is that acetylene gas is obtained from sodium fumarate and sodium malate.

### Final Answer:
Acetylene gas is obtained from sodium fumarate and sodium malate.