What this practice covers
These questions are drawn from past CIE 9701 Chemistry papers and filtered to halogen compounds. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
Start practising practice questions →
What examiners see students get wrong here
These are the errors that cost marks on halogen compounds, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Explaining the hydrolysis trend with polarity. It is bond energy, and polarity would predict the opposite.
- Forgetting that the solvent decides substitution against elimination.
- Drawing the nucleophile's curly arrow from the charge rather than from the lone pair.
- Forgetting excess ammonia, and so not explaining why further substitution is suppressed.
- Missing that KCN adds a carbon to the chain, which is usually the point of a synthesis question.
- Saying CFCs damage ozone because they are reactive. They cause harm because they are unreactive and persist.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Halogen compounds revision notes.