CAIE A Level Chemistry 9701 · Analytical techniques
A student records the infrared spectrum of ethyl ethanoate, . The spectrum shows a strong, sharp absorption at about 1740 cm⁻¹ and a strong, broad absorption at about 1240 cm⁻¹.
Describe how the student can use these absorptions to identify the functional groups present in ethyl ethanoate.
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.
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