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.
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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.
- Predicting ring substitution under ultraviolet light, or side-chain substitution with a halogen carrier.
- Forgetting that methylbenzene gives two ring products, at positions 2 and 4.
- Explaining the low reactivity of chlorobenzene only by bond strength, and leaving out the repulsion of the nucleophile by the ring.
- Saying the C-Cl bond in chlorobenzene is stronger because chlorine is more electronegative there. The electronegativity is the same; the difference is the delocalisation of the lone pair into the ring.
- Saying chlorobenzene gives a precipitate slowly with silver nitrate. It gives none under those conditions.
- Treating (chloromethyl)benzene as unreactive because it contains a benzene ring. Its C-Cl bond is on the side-chain and behaves normally.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Halogen compounds revision notes.