DP Chemistry (last assessment 2024)
Question 20N.3.sl.TZ0.b(ii)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.sl.TZ0.b(ii) |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Identify | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 2]
20N.3.sl.TZ0.b(ii)
The diverse functions of biological molecules depend on their structure and shape.
Sucrose is a disaccharide formed in the reaction of glucose with fructose.
Identify the reaction type and the newly formed functional group that joins the monosaccharide units in the product.
[2]
Markscheme
Reaction type:
condensation ✔
Accept “nucleophilic substitution/” for M1.
Functional group:
acetal/ether/glycosidic «linkage» ✔
Accept “glycoside” for M2.
Examiners report
Many candidates scored both marks here. Ether was the most common answer for M2 with some responding glycosidic.