DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.24
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.24 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 24 | Adapted from | N/A |
24.
[Maximum mark: 1]
19M.1A.SL.TZ1.24
Which functional group is surrounded in the molecule?
A. hydroxyl
B. carboxyl
C. carbonyl
D. ether
[1]
Markscheme
C
Examiners report
One G2 comment stated “the functional group by definition is an aldehyde, however, students must assume that the H should be considered as an 'R group in order to call it a carbonyl”. However, aldehyde was not an alternative answer, with the main misconception considering the C=O as a carboxyl rather than carbonyl.
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.2—Functional groups give characteristic physical and chemical properties to a compound. Organic compounds are divided into classes according to the functional groups present in their molecules. Identify the following functional groups by name and structure: halogeno, hydroxyl, carbonyl, carboxyl, alkoxy, amino, amido, ester, phenyl.