DP Chemistry (first assessment 2025)
Question 21N.1A.HL.TZ0.35
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.1A.HL.TZ0.35 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 35 | Adapted from | N/A |
35.
[Maximum mark: 1]
21N.1A.HL.TZ0.35
Which statement is correct about configurational isomers?
A. Configurational isomers can only be interconverted by breaking and reforming bonds.
B. Configurational isomers have different molecular formulas but the same structural formulas.
C. Configurational isomers are not distinct compounds.
D. Configurational isomers always have identical physical properties.
[1]
Markscheme
A
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).