Question

Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to:

• A. The formation of less stable carbonium ion
• B. Resonance stabilisation
• C. Inductive effect
• D. Larger carbon halogen bond

Answer 1

The correct option is B Resonance stabilisation

In the case of aryl halides, the halogen is attached to $s{p}^2$ hybridized carbon of the benzene ring. Due to resonance, there is partial double bond characters in the C-X bond. And C-X bond length in haloarene is is smaller than C-X bond length in Alkyl halide.