DP Chemistry (first assessment 2025)
Question 22M.2.HL.TZ1.3f(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.HL.TZ1.3f(i) |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | f(i) | Adapted from | N/A |
f(i).
[Maximum mark: 1]
22M.2.HL.TZ1.3f(i)
(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
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.9—Nucleophilic substitution reactions include the reactions between halogenoalkanes and nucleophiles. Describe and explain the mechanisms of the reactions of primary and tertiary halogenoalkanes with nucleophiles.