A Levels Chemistry (9701)•9701/12/M/J/24
Explanation
Addition Polymerization Mechanism
Steps:
- Identify monomer Z as an alkene with a C=C double bond suitable for addition.
- Recall that addition polymers form by breaking the double bond, linking monomers via free radical or chain reaction without eliminating small molecules.
- Determine the repeating unit: the opened alkene structure connected head-to-tail.
- Compare choices to find the linear chain with Z's modified unit.
Why D is correct:
- D depicts the repeating -[CH₂-CHZ]- unit, matching the addition polymerization definition where the double bond becomes a single bond in the chain.
Why the others are wrong:
- A shows ester linkages, typical of condensation polymers like polyesters.
- B has branched structure, not the linear chain from simple addition.
- C retains the double bond, which breaks in actual polymerization.
Final answer: D
Topic: Polymerisation
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