Electrolysis of which of the following yields benzene?

Which of the following statements is not applicable to electrolytic conductors?

For the extraction of sodium from $NaCl$,an electrolytic mixture of $NaCl + Na_3AlF_6 + CaCl_2$ is used. During the extraction process,only sodium is deposited at the cathode,while $K$ and $Ca$ are not,because:

When an aqueous solution of sodium sulfate $(Na_2SO_4)$ is electrolyzed using platinum electrodes,what are the products at the cathode and anode,respectively?

In the electrolysis of aqueous copper sulphate $(CuSO_4)$ using inert electrodes,the gases evolved at the anode and cathode are,respectively:

The product obtained from the electrolytic oxidation of acidified sulphate solution is: