1. In haloarenes, the carbon atom is sp2 hybridised. The sp2 hybridised orbitais arc shorter and holds the electron pair bond more.
2. Halogen atom contains p-orbital with lone pair of electrons which interacts with π – orbitaIs of berizene ring to form extended conjugated system of π – orbitals.
3. The delocalisation of these electrons give double bond character to C-X bond.
The resonance structure of halobenzene are given as:
