CAIE A Level Chemistry 9701 · Carbonyl compounds
A colourless liquid was thought to be an organic compound containing a carbonyl group. Describe how 2,4-dinitrophenylhydrazine (2,4-DNPH) reagent could be used to show that the liquid contains a carbonyl group, and state the observation expected for a positive result.
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.
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.