Question

when do we get geminal dihalide and vicinal dihalide

Answer 1

Vicinal dihalides, compounds that have halogens on adjacent carbons, are prepared by the reaction between a halogen and an alkene. The simplest example is the reaction between ethylene and chlorine to give 1,2-dichloroethane (ethylene dichloride).

The geminal dihalides or gem-dihalides are the organic compounds in which two halogen atoms are attached to same carbon atom .