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Identify vinyl chloride and styrene as commercially significant monomers by both their systematic and common names
- Ethylene monomers can be modified by adding functional groups, which replace hydrogen atoms.
- The modified monomers can be polymerised.
| Functional group | Monomer common name | Monomer systemic name | Polymer common name | Polymer systemic name |
| Chlorine (Cl) | Vinyl chloride | Chloroethene | Polyvinyl chloride | Polychloroethene |
| Phenyl (C6H5) | Styrene | Ethenylbenzene | Polystyrene | Polyethenylbenzene |
 Structure of vinyl chloride |  Structure of styrene |