DP Chemistry (first assessment 2025)
Question 22M.2.HL.TZ2.e(ii)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.HL.TZ2.e(ii) |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | e(ii) | Adapted from | N/A |
e(ii).
[Maximum mark: 1]
22M.2.HL.TZ2.e(ii)
Deduce the splitting pattern in the 1H NMR spectrum for 1-bromopropane.
[1]
Markscheme
triplet/3 AND multiplet/6 AND triplet/3 ✔
Examiners report
Another of the very poorly answered questions where most candidates (90%) failed to predict 3 peaks and when they did, considered there would be a quartet instead of multiplet/sextet; other candidates seemed to have no idea at all. This is strange because the compound is relatively simple and while some teachers considered that predicting a sextet may be beyond the current curriculum or just too difficult, they could refer to a multiplet; a quartet is clearly incorrect.
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.11—Individual signals can be split into clusters of peaks. Interpret 1H NMR spectra from splitting patterns showing singlets, doublets, triplets and quartets to deduce greater structural detail. Data for interpretation of 1H NMR spectra are given in the data booklet.