Answer: Ethene
Step-by-step explanation:
Ethene is the monomer that makes polythene. It is most commonly known as plastic. It is primarily used for packing( plastic bags, plastic films, et cetera).
It is known to have a chemical formula of (C2H4)n. Polyethylene is usually mixture made of similar types of polymers of ethylene with various values of n.
Ethene is the monomer having molecular formula C2H4 is a gaseous hydrocarbon.