DP Chemistry (first assessment 2025)
Question 20N.1A.HL.TZ0.27
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.1A.HL.TZ0.27 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 27 | Adapted from | N/A |
27.
[Maximum mark: 1]
20N.1A.HL.TZ0.27
Which mechanism does benzene most readily undergo?
A. Nucleophilic substitution
B. Electrophilic substitution
C. Electrophilic addition
D. Free radical substitution
[1]
Markscheme
B
Examiners report
Vast majority of candidates understood benzene undergoes substitution rather than addition, with some thinking of it as nucleophilic rather than electrophilic substitution.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.13—Electrophilic substitution reactions include the reactions of benzene with electrophiles. Describe and explain the mechanism of the reaction between benzene and a charged electrophile, E+.