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JEE Advanced levelSingle correct optionDifficulty 3 of 3pl147

Match each monomer with the chain-growth mechanism for which it is best suited. P: isobutene ; Q: acrylonitrile ; R: ethyl vinyl ether ; S: methyl methacrylate . (Cationic: electron-donating substituent stabilises the carbocation; anionic: electron-withdrawing substituent stabilises the carbanion.)

  1. AP and R cationic; Q and S anionic
  2. BP and Q cationic; R and S anionic
  3. CQ and R cationic; P and S anionic
  4. DR and S cationic; P and Q anionic

Answer: A

Two methyl groups on isobutene and the alkoxy group of the vinyl ether donate electrons and stabilise a carbocation, so P and R suit cationic polymerisation. The nitrile and ester groups of Q and S withdraw electrons and stabilise a carbanion, so they suit anionic polymerisation.
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