Question

why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides ​

Answer 1

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

Aryl halides are more stable and less reactive due to resonance where the lone pair of electrons are in conjugation with a pie bond whereas in alkyl halides the carbon halogen bond is a sigma bond making aryl halides more stable than alkyl halides.

• So the bond energy between C-Cl increases so reactivity decrease.