What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to formulae, functional groups and terminology. 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 formulae, functional groups and terminology, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Drawing a displayed formula with a carbon showing three or five bonds.
- Writing the alcohol group as a lump "OH" in a displayed formula instead of showing the C-O and O-H bonds separately.
- Saying members of a homologous series differ by CH₃. They differ by CH₂.
- Using CₙH₂ₙ for an alkane. That is the alkene formula; alkanes are CₙH₂ₙ₊₂.
- Counting the acid carbon twice in CₙH₂ₙ₊₁COOH.
- Calling two drawings of the same molecule "isomers" because they have been turned round on the page.
- Saying isomers have identical properties. They share a molecular formula, nothing more.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Formulae, functional groups and terminology revision notes.