DP Chemistry (last assessment 2024)
Question 19M.2.sl.TZ1.c(i)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.sl.TZ1.c(i) |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | c(i) | Adapted from | N/A |
c(i).
[Maximum mark: 2]
19M.2.sl.TZ1.c(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
Drawing or describing the homolytic fission of bromine was generally done well.
