[4] Aqueous solution of an organic compound, ' $A$ ' on electrolysis liberates acetylene and $\mathrm{CO}_2$ at anode. ' $A$ ' is

• A

  potassium acetate
• B

  potassium succinate
• C

  potassium citrate
• Correct answer
  D

  potassium maleate

Hence, the correct answer is option: 'D'.