Free Formulae, functional groups & naming questions for IGCSE Chemistry (0620), part of Organic chemistry. Each question has the answer and the marking points an examiner would look for.
Generate a full Formulae, Functional Groups & Naming worksheet →All Organic chemistry questionsEthanol is made by fermentation and by the catalytic addition of steam to ethene.
Which row is correct?
| fermentation | addition of steam | |
|---|---|---|
| A | produces pure ethanol | uses yeast |
| B | high temperature and pressure | batch process |
| C | continuous process | uses a renewable raw material |
| D | uses a renewable raw material | continuous process |
Answer: D
Which compound is shown?
Answer: A
Propanoic acid reacts with ethanol to form an ester.
What are the name and the structural formula of the ester?
| name | structural formula | |
|---|---|---|
| A | ethyl propanoate | CH3CH2COOCH2CH3 |
| B | ethyl propanoate | CH3COOCH2CH2CH3 |
| C | propyl ethanoate | CH3COOCH2CH2CH3 |
| D | propyl ethanoate | CH3CH2COOCH2CH3 |
Answer: A
Butane and methylpropane both have the formula C₄H₁₀.
State the term for compounds with the same molecular formula but different structural formulae.
Draw/describe the structural formula of methylpropane.
State the general formula of the alkanes.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | structural isomers structural isomers B1 | 1 |
| (b) | CH₃CH(CH₃)CH₃ CH₃CH(CH₃)CH₃ B1 | 1 |
| (c) | CₙH₂ₙ₊₂ CₙH₂ₙ₊₂ B1 | 1 |
Organic compounds are named according to their functional groups.
Name the functional group in carboxylic acids and in alcohols.
Give the name of CH₃CH₂CH₂OH.
Give the molecular formula of butene.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | –COOH; –OH carboxylic acid: –COOH B1 alcohol: –OH B1 | 2 |
| (b) | propan-1-ol propan-1-ol (propanol) B1 | 1 |
| (c) | C₄H₈ C₄H₈ B1 | 1 |
Ethanol, C₂H₅OH, and ethene, C₂H₄, are organic compounds.
Name the homologous series to which each belongs.
State two characteristics of a homologous series.
Draw the displayed formula of ethanol.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | alcohols; alkenes ethanol: alcohols B1 ethene: alkenes B1 | 2 |
| (b) | same general formula; same functional group; similar chemical properties; trend in physical properties Any 2 of: same general formula; same functional group; similar chemical properties; gradual change in physical properties B2 | 2 |
| (c) | H–C(H)(H)–C(H)(H)–O–H correct displayed formula showing all atoms and bonds B1 | 1 |
Riyaz Shaikh has mentored IGCSE, IB and A Level students for 15+ years, one-on-one, online and in Mumbai. The hardest questions on this site are the ones he uses to find a student's weak points.
Meet Riyaz →Original Cambridge-style practice questions written for mentorriyaz.in. These are not Cambridge past paper questions, and this site is not affiliated with or endorsed by Cambridge University Press & Assessment. Updated 2026-11-04. Paper generator · mentorriyaz.in