CAIE A Level Chemistry 9701 · Hydrocarbons
Alkanes are generally unreactive towards polar reagents such as acids and alkalis, yet they do react with chlorine in the presence of ultraviolet light. Compare the reactivity of alkanes towards polar reagents with their reactivity towards chlorine, and explain the difference in terms of the structure of alkane molecules and the type of reaction involved.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.