O Levels Chemistry (5070)•5070/12/M/J/22
Explanation
Monomer Identification from Polymer Repeat Unit
Steps:
- Examine the repeat unit structure to identify the carbon chain and functional groups.
- Look for the linkage pattern, such as single bonds from an original double bond in addition polymerization.
- Match the repeat unit to the monomer by reversing the polymerization, adding a double bond where the chain connects.
- Compare with choices to find the exact structural match.
Why A is correct:
- The repeat unit matches the addition polymer of the alkene in A, where the double bond opens to form -CH2-CH(R)- linkages per the addition polymerization mechanism.
Why the others are wrong:
- B has a branched chain not present in the repeat unit.
- C includes an extra functional group like a carbonyl, absent in the unit.
- D features a cyclic structure, unlike the linear repeat unit.
Final answer: A
Topic: Polymers
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