CAIE A Level Chemistry 9701 · Halogen compounds
A student plans to prepare chlorobenzene from benzene and then compare its reactivity with chloroethane.
(a) Describe how the student could prepare chlorobenzene from benzene, naming the reagent(s) and catalyst.
(b) Chlorobenzene does not undergo nucleophilic substitution with aqueous alkali, whereas chloroethane does. Explain this difference in reactivity.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.