Answer:
An addition reaction occurs when two or more reactants combine to form a single product.
Addition reactions occur with unsaturated compounds.
The general equation for an addition reaction: A+BA+B →→ C
Hydrohalogenation involves the addition of a hydrogen atom and a halogen atom to an unsaturated compound (containing a carbon-carbon double bond).
A polymer is made up of lots of smaller units called monomers. When these monomers are added together, they form a polymer. One way for polymerization to occur is through an addition reaction. Example: The polymerization of vinyl chloride monomers to form a polyvinyl chloride polymer.
Halogenation is very similar to hydrohalogenation but a diatomic halogen molecule is added across the double bond.
Hydrogenation involves adding hydrogen to an alkene. During hydrogenation the double bond is broken (as with hydrohalogenation and halogenation) and more hydrogen atoms are added to the molecule