Question

Question #115a7

Answer 1

It is a nucleophilic substitution

Explanation:

As you know, KCN will dissociate into `K^+` and `CN^-`. Now due to electronegativity differences, the nitrogen will have a predominantly negative partial charge. Hence, it will be the part of the species that attacks the positive charge on the haloalkane. The rest should be obvious from the mechanism: