IGCSE Edexcel Chemistry Practice Test

The name of a polymer often comes from the name of the monomer it’s built from, with a poly- prefix indicating many units. Here, the monomer is ethene, and forming a polymer from it gives a name that directly includes that monomer: polyethene. That direct link to ethene is why this is the best choice.

Ethene is the simple alkene with the repeating unit -CH2-CH2-, and polymerizing many ethene units yields the long-chain polymer. The more common everyday spelling polyethylene also refers to the same material, but the form polyethene explicitly shows derivation from ethene. The other options point to polymers derived from different monomers or from a slightly altered name (like ethylene/ethylene-based naming), so they don’t match the idea of being derived from ethene as clearly.