Alkene Reactions Addition Reactions - only one product 1. Hydrogenation (H 2 ): Alkene + Hydrogen --> Alkane 2. Halogenation (X 2 ): Alkene + diatomic halogen --> Dihaloalkane 3. Halgenation (HX): Alkene + HX --> Haloalkane 4. Hydration (HOH): Alkene + HOH --> alcohol 5. Polymerization: Many alkenes add together into a long alkane chain
1. Hydrogenation Reaction Alkene + Hydrogen --> Alkane Hydrogen molecule adds to carbons with double bond.
2. Halogenation Reaction Alkene + Halogen --> Dihaloalkane Halogen molecule adds to carbons with double bond.
Unsymmetrical Addition Reactions Markovnikov’s Rule For double bonds that have unequal numbers of hydrogen atoms attached. For unsymmetrical reactants such as HX and HOH The hydrogen of the reactant goes to the carbon of the double bond that already has the most hydrogen atoms. “the rich get richer” The -X or the -OH go the other carbon (the one with the least amount of hydrogen
3. Halogenation Reaction Alkene + HX --> haloalkane HCl molecule adds to carbons with double bond.
4. Hydration Reaction Alkene + HOH --> alcohol HOH molecule adds to carbons with double bond.
5. Polymerization Reaction Alkene + Alkene + Alkene --> long chain of carbons Double bonds convert to single bonds