Which of the following options correctly pairs a polymer with its monomer?

• A. $\mathrm{Polyethylene}$ - $\mathrm{Ethylene}$
• B. $\mathrm{Polystyrene}$ - $\mathrm{Styrene} \mathrm{oxide}$
• C. $\mathrm{Polypropylene}$ - $\mathrm{Vinyl} \mathrm{chloride}$
• D. $\mathrm{Polyvinyl} \mathrm{chloride}$ - $\mathrm{Propylene}$

Answer: (A)

Verified step by step guidance

1. Understand the concept of polymers and monomers: A polymer is a large molecule composed of repeating structural units called monomers. Each polymer is formed from a specific type of monomer through a process called polymerization.
2. Identify the monomer for Polyethylene: Polyethylene is a polymer made from the monomer ethylene. The polymerization of ethylene involves the opening of the double bond in ethylene molecules to form long chains.
3. Identify the monomer for Polystyrene: Polystyrene is a polymer made from the monomer styrene, not styrene oxide. Styrene is a vinyl group attached to a benzene ring, and it polymerizes through the opening of the vinyl group.
4. Identify the monomer for Polypropylene: Polypropylene is a polymer made from the monomer propylene, not vinyl chloride. Propylene is a propene molecule, which is a three-carbon alkene with a double bond.
5. Identify the monomer for Polyvinyl chloride: Polyvinyl chloride (PVC) is a polymer made from the monomer vinyl chloride, not propylene. Vinyl chloride is a chloroethene molecule, which polymerizes through the opening of the double bond.