DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.22a(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ1.22a(ii) |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Deduce | Question number | a(ii) | Adapted from | N/A |
a(ii).
[Maximum mark: 1]
19M.3.hl.TZ1.22a(ii)
This question is about antiviral drugs.
Oseltamivir, used for the treatment of severe flu, is inactive until converted in the liver to its active carboxylate form.
(a(ii))
The resulting active metabolite of oseltamivir can be detected by mass spectrometry (MS) analysis.
Deduce the mass of the expected carboxylate ion.
Mr oseltamivir = 312
[1]
Markscheme
283 [✔]
Examiners report
The challenge continued where the expected mass of the carboxylate ion was required. Some candidates chose values that exceeded the molar mass of oseltamivir itself, and some chose 45. There were very few correct answers.
