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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl150

Select all the correct statements about free radical polymerisation of a vinyl monomer.

  1. ATermination by combination of two growing chains gives one chain with twice the number of monomer units
  2. BThe propagating chain end carries a negative charge
  3. CChain transfer to solvent or polymer can lower the average molar mass
  4. DTermination by disproportionation gives one saturated and one unsaturated dead chain

Answer: A, C, D

Chain transfer ends one chain and starts another, so molar mass falls. Combination joins two radicals into one chain; disproportionation transfers a hydrogen atom between two radicals. The growing end is a neutral radical, not an anion.
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