What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to organic chemistry. 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 organic chemistry, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Writing "clear" instead of "colourless" for the bromine test.
- Saying an alkane decolourises bromine water.
- Getting the general formulas the wrong way round.
- Saying the fractionating column is cool at the bottom.
- Saying cracking produces only alkanes. It must produce an alkene.
- Writing an unbalanced cracking equation.
- Saying addition polymerisation releases water. That is condensation polymerisation.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Organic chemistry revision notes.