In the mechanism of free-radical addition polymerization, the chain termination step halts the growth of the macromolecule. Which of the following specific reactions serve as standard termination mech

Question

In the mechanism of free-radical addition polymerization, the chain termination step halts the growth of the macromolecule. Which of the following specific reactions serve as standard termination mechanisms?

Prashant Kotian · Accepted Answer

Correct answer: A,B. Free radical chains generally terminate by the collision of two active radical ends. This can happen via direct coupling (combination) forming a single long chain, or by disproportionation, yielding two separate chains (one with an alkane end, one with an alkene end). Back-biting causes branching (transfer), not immediate termination.

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