CAIE A Level Chemistry 9701 · Analytical techniques

Analytical techniques: suggest question

Suggest4 marksStandard

A student records the proton NMR spectrum of a colourless liquid with the molecular formula $\ce{C4H8O2}$ . The spectrum shows three signals.

Signal A: chemical shift 1.1 ppm, integration ratio 3, triplet
Signal B: chemical shift 2.1 ppm, integration ratio 3, singlet
Signal C: chemical shift 4.1 ppm, integration ratio 2, quartet

Suggest a structure for the liquid that is consistent with all this information. Explain how you used the chemical shifts, integration ratios and splitting patterns to reach your answer.

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.

Analytical techniques: suggest question

How this question is marked

More Analytical techniques questions