A-LevelChemistryAnalytical techniques9701/42 · May/June 2025 · Q86 Marks
Compound A is analysed by carbon-13 NMR and proton (1H) NMR spectroscopy. [Figure 8.1] (structure of A)
- (a)State the reference substance and a solvent that can be used in NMR spectroscopy. reference ............................................ solvent ............................................[1]
- (b)Predict the number of peaks in the carbon-13 NMR spectrum of A.[1]
- (c)The proton (1H) NMR spectrum of A shows peaks in four different chemical environments. Complete Table 8.1 for the proton (1H) NMR spectrum of A. [Table 8.1][4]
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Mark scheme
Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.
- [1] reference: TMS / tetramethylsilane / (CH3)4Si AND solvent: D2O / CDC13
- [1] six / 6 peaks
- [1] chemical shift δ/ppm 1.10 triplet 2 3
- [1] 1.50 doublet 1 6
- [1] 2.45 quartet/quad ruplet 3 2
- [1] 3.75 multiplet 6 1
- Any three [1] any six [2] any nine [3] all eleven [4]
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