1. Carbon compounds containing more than one halogen atom are called polyhalogen compounds.
2. They are classified as
- gem dihalides
- Vicinal dihalides.
(a) Gem dihalide:
In this compound, two halogen atoms are attached to one carbon atom.
e.g, CH3CHCl2 – ethylidene chloride.
(b) Vicinal dihalide:
In this compound, two halogen atoms are attached to two adjacent carbon atoms.
1,2 - dichloroethane