Solution The organic compounds containing Carbon C atoms and having double bonds between two Carbon atoms are called unsaturated hydrocarbons. The halogenation of alkene is a reaction in which a dihalide is added to a molecule after the double bond linked between Carbon atoms has been broken.

The mechanism of hydration of ethene to form ethanol involves three steps. Step 1: Protonation of ethene to form carbocation by electrophilic attack of H 3 O +: Step 2: Nucleophilic attack of water on carbocation: Step 3: Deprotonation to form ethanol: