Question

Why are aryl halides less reactive than alkyl halides towards nucleophilic substitution reactions ?

Answer 1

$\begin{array}{c}\text{Aryl halides are less reactive towards nucleophilic}\text{substitution reaction as compared to alkyl}\\ \text{halides is because of resonance stabilization}\text{in aryl halide. Due to resonance, C-X bond becomes}\\ \text{shorter and stronger and cannot be easily replaced}\text{by nucleophiles.}\end{array}$