A Levels Chemistry (9701)•9701/14/M/J/25
Explanation
Polymerization from Monomer Structure
Steps:
- Examine the polymer chain's repeating unit to identify the linkage type (e.g., ester, amide).
- Compare the polymer's functional groups to each monomer's reactive ends.
- Match the monomer that, upon reaction, forms the exact bond and side chain in the polymer.
- Eliminate monomers with mismatched functional groups or chain lengths.
Why A is correct:
- Monomer A has the vinyl chloride structure (CH2=CHCl), which undergoes addition polymerization to form polyvinyl chloride (PVC) with the -[CH2-CHCl]- repeating unit.
Why the others are wrong:
- B is ethylene (CH2=CH2), forming polyethylene (-[CH2-CH2]-) without chlorine.
- C is propylene (CH2=CH-CH3), forming polypropylene with methyl side chains.
- D is styrene (CH2=CH-C6H5), forming polystyrene with phenyl groups.
Not enough information: Diagram and choice structures not provided.
Final answer: A
Topic: Polymerisation
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