Question 20N.2.sl.TZ0.d(vi)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.2.sl.TZ0.d(vi) |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | Deduce | Question number | d(vi) | Adapted from | N/A |
Chlorine undergoes many reactions.
Deduce the number of signals and their chemical shifts in the spectrum of ethoxyethane. Use section 27 of the data booklet.
[2]
«signals» ✔
AND ✔
Accept any values in the ranges.
Award [1 max] for two incorrect chemical shifts.
Nearly half of the candidates were able to identify the number of signals obtained in the 1H NMR spectrum of ethoxyethane, obtaining the first mark of this question. Many candidates were awarded the mark as 'error carried forward' from an incorrect structure of ethoxyethane. The second mark for this question required candidates to look up values of chemical shift from the data booklet. Nearly a third of the candidates were able to match the chemical environments of the hydrogen atoms in ethoxyethane to those listed in the data booklet successfully.
