DP Chemistry (last assessment 2024)
Question 19M.2.sl.TZ2.c(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.sl.TZ2.c(ii) |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | State | Question number | c(ii) | Adapted from | N/A |
c(ii).
[Maximum mark: 1]
19M.2.sl.TZ2.c(ii)
Ethyne, C2H2, reacts with oxygen in welding torches.
Ethyne reacts with steam.
C2H2 (g) + H2O (g) → C2H4O (g)
Two possible products are:
State the name of product B, applying IUPAC rules.
[1]
Markscheme
ethanal [✔]
Examiners report
60 % of the candidates were able to name compound B as ethanal. Some candidates did not recognize it as an aldehyde and gave names related to carboxylic acids or other homologous series. Other candidates called it methanal.
