DP Chemistry (last assessment 2024)
Question 19M.2.hl.TZ1.d(i)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.hl.TZ1.d(i) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | d(i) | Adapted from | N/A |
d(i).
[Maximum mark: 2]
19M.2.hl.TZ1.d(i)
Xylene is a derivative of benzene. One isomer is 1,4-dimethylbenzene.
Bromine reacts with alkanes.
Identify the initiation step of the reaction and its conditions.
[2]
Markscheme
Br2 2Br• [✔]
«sun»light/UV/hv
OR
high temperature [✔]
Note: Do not penalize missing radical symbol on Br.
Accept “homolytic fission of bromine” for M1.
Examiners report
Very well done, with a few making reference to a catalyst.
