Monomer of polythene is:
The repeating structural units which are derived from some simple and reactive molecules are known as Monomers.
Polythene is the most common plastic. It is prepared by polymerisation.
Polymerisation is a process in which large number of simple (same or different) molecules (Monomers) combine to form a bigger molecule of higher molecular mass.
Ethene is the monomer of polythene, it undergoes polymerisation at high temperature and pressure in presence of catalyst to form polythene polymer.