CAIE A Level Chemistry 9701 · Hydrocarbons
Ethane reacts with chlorine in the presence of ultraviolet light to form chloroethane, .
Explain the mechanism of this reaction, with reference to the initiation, propagation and termination steps.
Include equations for the steps you describe.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.