JEE Main · ChemistryHard
Consider the anionic polymerization of initiated by in a non-polar solvent. Which of the following statements regarding the kinetics and mechanism is correct?
- A.The rate of polymerization is independent of the initiator concentration.
- B.The polymerization proceeds via a living mechanism with no inherent termination step.
- C.The rate of propagation is directly proportional to the square root of the initiator concentration.
- D.The reaction is characterized by a rapid termination step involving radical coupling.
Show correct answer & step-by-step solution
Correct answer: B — The polymerization proceeds via a living mechanism with no inherent termination step.
Solution
- The initiation involves the nucleophilic attack of on the vinyl group of styrene.
- In non-polar solvents, the active species exists as an ion pair or aggregate.
- Since there is no inherent termination or chain transfer mechanism in the absence of impurities, the chain ends remain active.
- This defines the process as a living polymerization.
- Hence the answer is (B).
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