Statement-I : Reactions of benzene diazonium chloride involving the replacement of -N2Cl group are nucleophilic substitution.Statement-II : -N2+ ion is a good leaving group in nucleophilic substitution.

Due to the presence of positive charge on more electronegative nitrogen atom, -N2+ group is a very good leaving group.This make the benzene ring electron deficient which can be attached by nucleophiles like Cl-, Br-, CN-, I-, NO-2 , H-, Ph- .