CAIE A Level Chemistry 9701 · Analytical techniques
The infrared spectrum of a compound with molecular formula C₄H₈O₂ shows a strong absorption at 1740 cm⁻¹ and a broad absorption between 2500 and 3300 cm⁻¹. Explain how this information can be used to identify the functional groups present in the compound.
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.
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