Explanation

(d)
Chile salt petre $\left( NaNO_{3} \right),$ potash alum
$(K_{2}SO_{4}.Al_{2}\left( SO_{4} \right)_{3}.24H_{2}O)$ and green vitriol $\left( FeSO_{4}.7H_{2}O \right)$ are ionic compounds. They produce ions in their aqueous solutions, so they are conducting in nature. Ethyl alcohol, $C_{2}H_{5}OH$ being covalent in nature, does not produce any ion in aqueous solution. Hence, it is non-conducting in nature.