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← ScienceWhich 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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