CAIE A Level Chemistry 9701 · Analytical techniques

Analytical techniques: suggest question

Suggest4 marksStandard

A colourless liquid has the molecular formula $\ce{C4H8O}$ . Its infrared spectrum shows a strong, sharp absorption at 1715 cm $^{-1}$ and no absorption in the range 2700–2850 cm $^{-1}$ .

Suggest, with a reason, which functional group is present in the molecule.

How this question is marked

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.

Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.

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