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CAIE A-Level Chemistry A2 37.3.1 Carbon 13 Nmr Interpretation Questions

Practise turning carbon-13 NMR peak numbers and shift ranges into carbon environments and possible structures.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • count peaks to set the number of chemically distinct carbon environments, considering symmetry
  • assign each δ value to a compatible carbon environment using the data table supplied
  • cross-check every proposed structure against molecular formula, all peaks and any chemical-test evidence

CAIE A-Level Chemistry A2 37.3.1 Carbon 13 Nmr Interpretation Questions question 1

[Maximum number: 2]

Benzene can be used to make benzoic acid in the two-step process shown in Fig. 7.1.

Fig. 7.1

Fig. 7.1

Methylbenzene and benzoic acid each have five different peaks in the carbon (13C)\left({ }^{13} \mathrm{C}\right) NMR spectrum.

Table 7.1

Table 7.1

Use Table 7.1 to complete the two sentences to suggest descriptions of these two spectra.
The carbon (13C)\left({ }^{13} \mathrm{C}\right) NMR spectrum of methylbenzene:
- has peak(s) in the chemical shift range of and
- has peak(s) in the chemical shift range of .

The carbon (13C)\left({ }^{13} \mathrm{C}\right) NMR spectrum of benzoic acid:
- has peak(s) in the chemical shift range of and
- has peak(s) in the chemical shift range of

。

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