DP Chemistry (first assessment 2025)
Question 22N.1A.HL.TZ0.40
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.HL.TZ0.40 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | Deduce | Question number | 40 | Adapted from | N/A |
40.
[Maximum mark: 1]
22N.1A.HL.TZ0.40
Which organic compound has the 1H NMR shown?
Source: Spectral Database for Organic Compounds, SDBS, n.d. [online] Available at:
https://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi [Accessed 6 October 2021].
A. Methanal
B. Ethanoic acid
C. Methyl ethanoate
D. Propanoic acid
[1]
Markscheme
D
Examiners report
Just under 70% of the candidates identified the 1H NMR spectrum as being that of propanoic acid. The most commonly mistakes were thinking it was ethanoic acid (B) or methyl ethanoate (C).
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).