Which of the following is a monomer?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which of the following is a monomer?

Explanation:
A monomer is a small molecule that can join with others to form a polymer in a process called addition polymerization. Ethene has a carbon–carbon double bond that can open up and link with other ethene molecules, so you can build long chains of repeating -CH2-CH2- units to make polyethylene. The other options aren’t monomers in this sense: polyethene is the polymer itself, not a single unit; dibromoethane lacks the C=C bond needed for the typical chain-growth polymerization; polychloroethene is already a polymer (PVC), derived from vinyl chloride, not a monomer.

A monomer is a small molecule that can join with others to form a polymer in a process called addition polymerization. Ethene has a carbon–carbon double bond that can open up and link with other ethene molecules, so you can build long chains of repeating -CH2-CH2- units to make polyethylene. The other options aren’t monomers in this sense: polyethene is the polymer itself, not a single unit; dibromoethane lacks the C=C bond needed for the typical chain-growth polymerization; polychloroethene is already a polymer (PVC), derived from vinyl chloride, not a monomer.

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