CAIE A Level Chemistry 9701 · Analytical techniques
A colourless organic compound has the molecular formula . Its infrared spectrum shows a strong, broad absorption between 2500 and 3300 cm, and a strong, sharp absorption at about 1710 cm.
Compare the information given by these two absorptions with the information that would be obtained from the infrared spectrum of a compound containing only a carbonyl group, such as propanone.
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.
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