DP Chemistry (last assessment 2024)
Question 19M.2.hl.TZ2.e
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.hl.TZ2.e |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Identify | Question number | e | Adapted from | N/A |
e.
[Maximum mark: 1]
19M.2.hl.TZ2.e
Phenylethene can be polymerized to form polyphenylethene (polystyrene, PS).
The major product of the reaction with hydrogen bromide is C6H5–CHBr–CH3 and the minor product is C6H5–CH2–CH2Br.
The minor product, C6H5–CH2–CH2Br, can be directly converted to an intermediate compound, X, which can then be directly converted to the acid C6H5–CH2–COOH.
C6H5–CH2–CH2Br → X → C6H5–CH2–COOH
Identify X.
[1]
Markscheme
C6H5–CH2–CH2OH [✔]
Examiners report
Quite well answered though some candidates suggested an aldehyde rather than the alcohol, or forgot that C has two hydrogens apart from the -OH. In other cases, they left a Br there.
