The reaction:
`CH_(3)CH_(2)I + KOH(aq)toCH_(3)CH_(2)OH+KI`
is classified as :
(a) electrophilic substitution (b) nucleophilic substitution
(c) elimination (d) addition

Explanation

`CH_(3)CH_(2)I + KOH(aq)toCH_(3)CH_(2)OH+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 `CH_(3)CH_(2)I` to form ethanol.