DP Chemistry (first assessment 2025)
Question 22N.1A.SL.TZ0.24
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.SL.TZ0.24 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | Determine | Question number | 24 | Adapted from | N/A |
24.
[Maximum mark: 1]
22N.1A.SL.TZ0.24
Which are isomers of C5H12?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
[1]
Markscheme
A
Examiners report
It was pleasing to see this question well answered despite the use of skeletal formulas. 74% of the candidates identified the isomers of C5H12 correctly.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.6—Strong and weak acids and bases differ in the extent of ionization. Recognize that acid–base equilibria lie in the direction of the weaker conjugate. and are strong acids, and group 1 hydroxides are strong bases.
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.6—Structural isomers are molecules that have the same molecular formula but different connectivities. Recognize isomers, including branched, straight-chain, position and functional group isomers.