DP Chemistry (last assessment 2024)
Question 22M.2.sl.TZ1.3f(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.sl.TZ1.3f(i) |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | f(i) | Adapted from | N/A |
f(i).
[Maximum mark: 1]
22M.2.sl.TZ1.3f(i)
Magnesium is a reactive metal often found in alloys.
Iodomethane is used to prepare CH3Mg. It can also be converted into methanol:
CH3 + HO– → CH3OH + –
(f(i))
Identify the type of reaction.
[1]
Markscheme
«nucleophilic» substitution
OR
SN2 ✔
Accept “hydrolysis”.
Accept SN1
Examiners report
About a quarter of the students identified this as a substitution reaction, though quite a number then lost the mark by incorrectly stating it was either "free radical" or "electrophilic". A very common wrong answer was "displacement" or "single displacement" and this makes one wonder whether this terminology is being taught instead of substitution
