plumiCombined techniques including NMR: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 6.3.2.4 Combined techniques including NMR, 2016–2025, with mark schemes and examiner’s reports where available.
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Q23(a)
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All 12 questions on Combined techniques including NMR, as a list
- June 2025, Paper 2, Q23(a) (4 marks): Compound K, C4H10O, is refluxed with H2SO4 to form a mixture of compound L and compound M. The infrared spectrum of compound K is shown. 100 50 Transmittance (%
- June 2025, Paper 2, Q23(b) (6 marks): This question is about spectral analysis. (b)* An unknown organic compound N is analysed and produces the following results. Elemental analysis by mass C, 62.07
- June 2024, Paper 2, Q24 (6 marks): 24* Analysis of an unknown organic compound J produces the following results. Elemental analysis by mass of compound J C, 80.60%; H, 7.46%; O, 11.94% Mass spect
- June 2023, Paper 2, Q23 (6 marks): 23* An unknown organic compound is analysed. The results are shown below. Addition of 2,4-DNP No visible change Elemental analysis by mass C, 66.63%; H, 11.18%;
- June 2022, Paper 2, Q16(b)(v) (4 marks): Compounds D and E are two more structural isomers of C6H12. Compounds D and E do not show stereoisomerism. Table 16.1 shows NMR and infrared (IR) spectral data
- November 2021, Paper 2, Q20(b)(ii) (6 marks): The pure sample of C is analysed to give the following results. Percentage composition by mass: C, 31.44%; H, 1.31%; N, 18.34%; O, 48.91%. The mass spectrum of
- November 2021, Paper 2, Q21 (6 marks): 21* Compounds D, E and F are isomers with the molecular formula C5H10O. One of the compounds is alicyclic. A student carries out test-tube tests on the compound
- November 2020, Paper 2, Q22(b) (6 marks): An organic compound I is analysed, using a combination of techniques. The analytical data is shown below. Elemental analysis by mass C, 56.69%; H, 7.09%; N, 11.
- June 2019, Paper 2, Q21 (6 marks): 21* Analysis of an unknown organic compound produced the following results. Elemental analysis by mass C: 73.17%; H: 7.32%; O: 19.51% Mass spectrum Molecular io
- June 2018, Paper 2, Q22(d) (6 marks): The relative molecular masses and boiling points of some fuels are shown in Table 22.1. Fuel Relative molecular mass Boiling point / °C hexane 86 69 pentan-1-ol
- June 2017, Paper 2, Q20(c) (3 marks): The carbon-13 NMR spectrum of the compound is shown below. 200 180 160 140 120 100 80 60 40 20 0 chemical shift, / ppm δ Using the spectrum and the results from
- June 2017, Paper 2, Q21 (6 marks): 21* Compound L is an organic compound containing carbon, hydrogen and oxygen only. The 1H NMR spectrum of compound L is shown below. The numbers by the peaks ar
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