Alkenes: past paper questions

Where the questions come from

• Question 32Oct/Nov 2025, paper 11Multiple choice1 mark

  Four different substances or types of substance are listed. 1 hydrogen 2 alcohols 3 alkenes 4 carboxylic acids Which substances are produced by cracking larger alkane molecules?

  Try this question
• Question 36Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  The formulae of two organic compounds, P and Q, are shown.

  Try this question
• Question 35Oct/Nov 2023, paper 13Multiple choice1 mark

  Ethene reacts with steam and with bromine in two separate reactions. What are the products of these two reactions?

  Try this question
• Question 34May/June 2026, paper 12Multiple choice1 mark

  Which formula represents a compound which turns aqueous bromine colourless?

  Try this question
• Question 35Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  L and M are different homologous series. The first three members of homologous series L all decolourise aqueous bromine. The first three members of homologous series M all dissolve in water to give solutions with a pH below 7.

  Try this question
• Question 37Oct/Nov 2023, paper 13Multiple choice1 markHas a diagram

  The flow diagram shows how poly(ethene) may be made from petroleum. $$\text{petroleum}\stackrel{1}{\to }\text{fuel oil}\stackrel{2}{\to }\text{ethene}\stackrel{3}{\to }\text{poly(ethene)}$$ What are stages 1, 2 and 3?

  Try this question
• Question 35May/June 2026, paper 13Multiple choice1 markHas a diagram

  Which structure represents ethene?

  Try this question
• Question 36Oct/Nov 2025, paper 12Multiple choice1 mark

  Which structure represents an unsaturated hydrocarbon?

  Try this question
• Question 37Oct/Nov 2024, paper 13Multiple choice1 mark

  Which statement describes how ethanol is manufactured from ethene?

  Try this question
• Question 31Oct/Nov 2023, paper 21Multiple choice1 markHas a diagram

  The structures of two molecules, X and Y, are shown.

  Try this question
• Question 34May/June 2026, paper 21Multiple choice1 mark

  Propene reacts separately with: • liquid bromine, ${\text{Br}}_2$ • hydrogen gas, ${\text{H}}_2$ • steam, ${\text{H}}_2\text{O}$. Which statement about these three reactions is correct?

  Try this question
• Question 36Oct/Nov 2025, paper 21Multiple choice1 mark

  Ethene reacts with hydrogen in an addition reaction to form ethane. Which catalyst is used for this reaction?

  Try this question
• Question 30Oct/Nov 2024, paper 21Multiple choice1 markHas a diagram

  Ethene reacts with steam to produce ethanol. Which row describes each compound?

  Try this question
• Question 36Oct/Nov 2023, paper 22Multiple choice1 mark

  The structure of an organic compound is shown. Which structure represents a molecule that reacts with steam to produce this product?

  Try this question
• Question 35May/June 2026, paper 22Multiple choice1 mark

  Which compound reacts rapidly with bromine to produce ${\text{CH}}_3{\text{CHBrCHBrCH}}_3$?

  Try this question
• Question 32Oct/Nov 2025, paper 22Multiple choice1 mark

  The alkenes are a homologous series. Which statement about the members of the homologous series of the alkenes is correct?

  Try this question
• Question 34Oct/Nov 2024, paper 21Multiple choice1 markHas a diagram

  Information about two reactions of ethene is listed.

  Try this question
• Question 35Oct/Nov 2023, paper 23Multiple choice1 mark

  Propene reacts with bromine to give one product only.

  Try this question
• Question 34May/June 2026, paper 23Multiple choice1 mark

  Which equation describes an addition reaction?

  Try this question
• Question 36Oct/Nov 2025, paper 22Multiple choice1 markHas a diagram

  Which row shows the products obtained by the cracking of a large alkane?

  Try this question
• Question 29Oct/Nov 2024, paper 22Multiple choice1 markHas a diagram

  Bromine reacts with but-2-ene. What is the displayed formula of the product of this reaction?

  Try this question
• Question 1Oct/Nov 2023, paper 43Structured6 marks

  A list of substances is shown.

  Try this question
• Question 35May/June 2026, paper 23Multiple choice1 mark

  Which reaction is used to make ethanol?

  Try this question
• Question 36Oct/Nov 2025, paper 23Multiple choice1 mark

  Propene undergoes addition reactions with bromine, hydrogen and steam. Which structures represent a product of these reactions?

  Try this question
• Question 35Oct/Nov 2024, paper 22Multiple choice1 mark

  Which equation represents an addition reaction?

  Try this question
• Question 32May/June 2023, paper 11Multiple choice1 markHas a diagram

  Part of the structure of a molecule of vitamin A is shown. Which statements about this part of the structure are correct?

  Try this question
• Question 1May/June 2026, paper 33Structured8 marksHas a diagram

  Six substances, A to F, are shown in Figure 1.1. Answer the following questions about these substances. Each substance may be used once, more than once or not at all.

  Try this question
• Question 4Oct/Nov 2025, paper 31Structured16 marksHas a diagram

  Molecules of compound C are produced by some plants. Fig. 4.1 shows the displayed formula of a molecule of compound C. Fig. 4.1 Deduce the molecular formula of compound C to show the number of atoms of carbon, hydrogen and oxygen.

  Try this question
• Question 35Oct/Nov 2024, paper 23Multiple choice1 mark

  Which statement about propene, ${\text{C}}_3{\text{H}}_6$, is correct?

  Try this question
• Question 34May/June 2023, paper 12Multiple choice1 mark

  Which compound rapidly decolourises aqueous bromine?

  Try this question