DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ1.e(i)
| Date | May 2021 | Marks available | [Maximum mark: 3] | Reference code | 21M.2.hl.TZ1.e(i) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Sketch | Question number | e(i) | Adapted from | N/A |
e(i).
[Maximum mark: 3]
21M.2.hl.TZ1.e(i)
Ethanol is obtained by the hydration of ethene, C2H4.
Alternative synthetic routes exist to produce alcohols.
Sketch the mechanism for the reaction of propene with hydrogen bromide using curly arrows.
[3]
Markscheme
curly arrow going from C=C to H of HBr AND curly arrow showing Br leaving ✔
representation of carbocation ✔
curly arrow going from lone pair/negative charge on Br− to C+ ✔
Award [2 max] for mechanism producing 1-brompropane.
