The reaction:
CH3CH2I+KOHaq→CH3CH2OH+KI is classified as :
(a) electrophilic substitution (b) nucleophilic substitution (c) elimination (d) addition
CH3CH2I+KOHaq→CH3CH2OH+KI
It is an example of nucleophilic substitution reaction. The hydroxyl group of KOH(OH−) with a lone pair of itself acts as a nucleophile and substitutes iodide ion in CH3CH2I to form ethanol.