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Which mechanism limits chain propagation in cyclohexane when exposed to UV radiation?

A)Unimolecular radical combination dominates
B)Hydrogen abstraction initiates termination
C)Recombination exceeds addition rates
D)Ring strain increases polymerization pathways

💡 Explanation

Unimolecular radical combination halts chain growth because the radicals created by UV light readily combine to form stable, non-reactive species; therefore, chain propagation stops, rather than adding multiple cyclohexane molecules together increasing polymer length.

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