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Which equation represents a termination step? A CH ext{ }_2 ext{ }CH ext{ }_3 + ext{Br}_2 → CH ext{ }_2 ext{ }CH ext{ }_2 + ext{HBr} B ext{ClO}• + ext{O}_3 → ext{Cl}• + 2 ext{O}_2 C RO• + ext{CH}_4 → ext{ROCH}_3 D CH ext{ }_2 ext{ }CFCI + ext{Cl}• → CH ext{ }_2 ext{ }CFC ext{ }C - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 3
Question 9
Which equation represents a termination step? A CH ext{ }_2 ext{ }CH ext{ }_3 + ext{Br}_2 → CH ext{ }_2 ext{ }CH ext{ }_2 + ext{HBr} B ext{ClO}• + ext{O}_3 → ... show full transcript
Worked Solution & Example Answer:Which equation represents a termination step? A CH ext{ }_2 ext{ }CH ext{ }_3 + ext{Br}_2 → CH ext{ }_2 ext{ }CH ext{ }_2 + ext{HBr} B ext{ClO}• + ext{O}_3 → ext{Cl}• + 2 ext{O}_2 C RO• + ext{CH}_4 → ext{ROCH}_3 D CH ext{ }_2 ext{ }CFCI + ext{Cl}• → CH ext{ }_2 ext{ }CFC ext{ }C - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 3
Step 1
Which equation represents a termination step?
Answer
The termination step in a reaction mechanism occurs when free radicals react to form a stable product, effectively removing radicals from the reaction.
Among the equations provided:
- A involves alkane and bromine radicals generating stable products but does not represent a termination step as it creates additional free radicals.
- B shows ext{ClO}• reacting to produce free radicals instead of leading to stability.
- C indicates the reaction of a radical with ext{CH}_4, again generating a radical.
- D illustrates the reaction between a radical (CH ext{ }_2 ext{ }CFCI) and chlorine, resulting in another radical, but it does signify an end of the radical action as it forms a stable molecule entirely.
Therefore, the correct answer is D.