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

Which of the following elements is extracted industrially by the electrolysis of its aqueous solution?

What will be the number of $Al^{+3}$ ions obtained upon the electrolysis of $AlCl_3$?

Electrolysis of aqueous copper $(II)$ sulphate between $Pt$ electrodes gives '$X$' at anode and '$Y$' at cathode. $X$ and $Y$ are respectively

$KOOC-CH_2-CH_2-COOK \xrightarrow{\text{electrolysis}} (A) (\text{major})$. Product $(A)$ is:

On electrolysis of aqueous solution of $KI$ in the presence of platinum electrodes,which of the following statements are correct?
$(a)$ Hydrogen gas is released at the cathode.
$(b)$ Oxygen gas is released at the anode.
$(c)$ $pOH$ of the solution decreases.
$(d)$ There is deposition of potassium at the cathode.