DP Chemistry (first assessment 2025)
Question 22M.2.HL.TZ1.6b(iii)
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.HL.TZ1.6b(iii) |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce | Question number | b(iii) | Adapted from | N/A |
b(iii).
[Maximum mark: 2]
22M.2.HL.TZ1.6b(iii)
(b(iii))
Deduce the number of signals that you would expect in the 1H NMR spectrum of nitrobenzene and the relative areas of these.
[2]
Markscheme
Number of signals: three/3 ✔
Relative areas: 2 : 2 : 1 ✔
Examiners report
Deducing the number of signals in the 1H NMR spectrum of nitrobenzene, which depend on the number of different hydrogen environments, was done poorly. Also, instead of relative areas, the common answer included chemical shift (ppm) values.
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.10—Proton nuclear magnetic resonance spectroscopy (1H NMR) gives information on the different chemical environments of hydrogen atoms in a molecule. Interpret 1H NMR spectra to deduce the structures of organic molecules from the number of signals, the chemical shifts, and the relative areas under signals (integration traces).