Organic chemistry GCSE questions
Cover the answers and try these Organic chemistry checks first. The full quiz in the app includes hints.
How to use these
Write your answer, then check. If you miss one, open the Organic chemistry lesson before you retry.
Practice questions
Cover the answers and have a go first. Worked solutions are underneath.
A hydrocarbon contains
Crude oil is
The general formula of alkanes is
As alkane chains get longer, boiling point
Common mistakes
- CO2 is not a hydrocarbon — it contains oxygen. Hydrocarbons are H and C only. Crude oil is not a compound.
- Do not say longer chains have stronger covalent bonds so higher boiling points. Boiling breaks intermolecular forces, not C–C bonds.
- Fractional distillation is a physical process. No new substances are made. Cracking (next lesson) is chemical.
- You cannot crack an alkane into two alkanes only and balance hydrogen. You usually need an alkene (fewer hydrogens).
Answers and working
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