DP Chemistry (first assessment 2025)
Question 22N.1A.HL.TZ0.33
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.HL.TZ0.33 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | Deduce | Question number | 33 | Adapted from | N/A |
33.
[Maximum mark: 1]
22N.1A.HL.TZ0.33
Which compound has a chiral carbon?
A. Bromoethane
B. 2-bromopropane
C. 2-bromobutane
D. 3-bromopentane
[1]
Markscheme
C
Examiners report
A well answered question, with over 83% deducing the name of the compound that contains a chiral carbon. The numbers choosing the distractors were all quite similar.
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.7—Stereoisomers have the same constitution (atom identities, connectivities and bond multiplicities) but different spatial arrangements of atoms. Describe and explain the features that give rise to cis-trans isomerism; recognize it in non-cyclic alkenes and C3 and C4 cycloalkanes. Draw stereochemical formulas showing the tetrahedral arrangement around a chiral carbon. Describe and explain a chiral carbon atom giving rise to stereoisomers with different optical properties. Recognize a pair of enantiomers as non-superimposable mirror images from 3D modelling (real or virtual).