In the electrolysis of molten $NaCl$,what happens at the anode?

On electrolysis of aqueous solution of $KI$ in presence of platinum electrodes:
$(a)$ Hydrogen gas is released at cathode
$(b)$ Oxygen gas is released at anode
$(c)$ $pOH$ of solution decreases
$(d)$ There is deposition of potassium at cathode
Choose the correct option from following

If electrolysis of aqueous $CuSO_4$ solution is carried out using $Cu$ electrodes, the reaction taking place at the anode is:

When $CuSO_4$ is electrolyzed using platinum electrodes,what happens?

Electrolysis of which of the following yields benzene?

During the electrolysis of aqueous sodium chloride,the product obtained at the anode is: