Alkenes: past paper questions

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• Question 32Oct/Nov 2024, paper 11Multiple choice1 mark

  Alkenes can be produced by the cracking of alkanes, such as decane, ${\text{C}}_{10}{\text{H}}_{22}$. Which equation shows the cracking of decane to produce two different alkenes and at least one other product?

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• Question 33Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  The diagrams show four structures of ${\mathrm{C}}_4{\mathrm{H}}_8$.

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• Question 34May/June 2026, paper 11Multiple choice1 mark

  How can alkenes be manufactured?

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• Question 34Oct/Nov 2025, paper 11Multiple choice1 mark

  Which compound reacts with hydrogen in an addition reaction?

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• Question 33Oct/Nov 2024, paper 11Multiple choice1 mark

  Alkenes undergo addition reactions with bromine to form dibromoalkanes. Which statement is correct?

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• Question 17Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  Hydrogen is used as a reactant both in the Haber process and in its addition to alkenes. Which row is correct?

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• Question 33May/June 2026, paper 12Multiple choice1 mark

  An unbranched alkene, ${\text{C}}_4{\text{H}}_8$, undergoes an addition reaction with bromine. What is the possible structure of the product?

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• Question 34Oct/Nov 2025, paper 12Multiple choice1 mark

  Which statement about propene is correct?

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• Question 35Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  Two reactions are shown.

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• Question 5Oct/Nov 2023, paper 21Structured10 marksHas a diagram

  Fig. 5.1 shows the displayed formula of compound A. Draw a circle around the functional group on Fig. 5.1 that is also present in alkenes.

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• Question 7Oct/Nov 2025, paper 21Structured13 marksHas a diagram

  Ethene is used to make ethanol and poly(ethene). Fig. 7.1 shows the displayed formula of ethene. Alkenes such as ethene are manufactured from hydrocarbons such as ${\mathrm{C}}_{12}{\mathrm{H}}_{26}$.

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• Question 36Oct/Nov 2024, paper 12Multiple choice1 mark

  Which statement about hydrocarbons is correct?

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• Question 5Oct/Nov 2023, paper 22Structured10 marksHas a diagram

  Fig. 5.1 shows the displayed formula of compound A. On Fig. 5.1, draw a circle around the functional group that reacts with aqueous bromine.

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• Question 8Oct/Nov 2025, paper 22Structured9 marksHas a diagram

  Fig. 8.1 shows the displayed formula of an unsaturated carboxylic acid, X. Explain why X is unsaturated.

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• Question 4Oct/Nov 2024, paper 21Structured14 marksHas a diagram

  This question is about alkanes and alkenes. But-1-ene belongs to the alkene homologous series. Members of the same homologous series differ from one member to the next by a –CH${}_2$– group and have similar chemical properties.

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• Question 36May/June 2023, paper 12Multiple choice1 mark

  Isoprene is an alkene which is commonly found in plants. Which properties does isoprene have?

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• Question 36May/June 2025, paper 11Multiple choice1 markHas a diagram

  The flowchart shows some reactions of hydrocarbons.

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• Question 4Oct/Nov 2024, paper 22Structured13 marksHas a diagram

  This question is about alkanes and alkenes. Butane belongs to the alkane homologous series. Members of the same homologous series have the same functional group and the same general formula.

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• Question 7May/June 2023, paper 22Structured10 marksHas a diagram

  Ethene, but-1-ene and but-2-ene are alkenes. The displayed formulae of ethene and but-1-ene are shown in Fig. 7.1. State the general formula of the homologous series of alkenes.

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• Question 34May/June 2025, paper 12Multiple choice1 markHas a diagram

  A molecule of the compound ${\text{C}}_4{\text{H}}_6$ is shown. This molecule undergoes two separate addition reactions. It undergoes an addition reaction with excess bromine and an addition reaction with steam.

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• Question 37May/June 2024, paper 11Multiple choice1 markHas a diagram

  Ethanol is produced using either ethene or glucose as the starting material. Which row is correct?

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• Question 3May/June 2025, paper 22Structured9 marksHas a diagram

  The equation for the reaction between ethene and bromine is shown in Fig. 3.1. Describe the observation when ethene gas is bubbled through aqueous bromine.

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