The function of aqueous KOH is to convert halogen to hydroxy group. So, ethyl chloride reacts with aq. KOH to give C2H5OH as: C2H5Aq.OH+EthylalcoholC2H5OH+KCl In C2H5OH all the four valencies of carbon are single bonded. So, hybridization of carbon atom in C2H5OH is sp3.