CAIE A-Level Chemistry 31.1 Halogen Compounds
Practise preparing halogenoarenes and explaining their lower substitution reactivity than halogenoalkanes.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- A2
Exam points
- prepare a halogenoarene by arene substitution with Cl2 or Br2 and the matching aluminium halide catalyst
- compare warm aqueous AgNO3 results for a halogenoalkane and a halogenoarene such as chlorobenzene
- link chlorine lone-pair delocalisation to partial double-bond character, a stronger C–Cl bond and lower reactivity
Covered syllabus points
31.1 Halogen compounds question 1
[Maximum number: 2]
Describe the difference in reactivity between chloroethane and chlorobenzene with OH−(aq).
Explain your answer.
chlorobenzene is less reactive than chloroethane OWTTE
- p-orbital / lone pair on Cl will overlap / delocalise into the ring
- due to partial double C-Cl bond OWTTE
OR C-Cl bond strengthened (more)
Any two [1], all three [2]
All question bank results loaded