Organic chemistry: past paper questions

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• Question 19May/June 2026, paper 11Multiple choice1 mark

  Which ion is present in dilute aqueous propanoic acid?

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• Question 30Oct/Nov 2025, paper 11Multiple choice1 mark

  How many structural isomers are there with the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_9\mathrm{C}\mathrm{l}$?

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• Question 19Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  An organic compound, X, has a molecular formula ${\text{C}}_4{\text{H}}_8{\text{O}}_2$ and turns damp blue litmus paper red. What is the displayed formula of X?

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• Question 7Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  Which row is correct?

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• Question 31May/June 2026, paper 11Multiple choice1 mark

  The structural formulae of three compounds are listed. 1 ${\text{CH}}_3\text{COOH}$ 2 ${\text{HCOOCH}}_3$ 3 ${\text{CH}}_3{\text{CH}}_2\text{OH}$ Which compounds are carboxylic acids?

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• Question 31Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  Which compound is not an alkane, alkene, alcohol or carboxylic acid?

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• Question 11Oct/Nov 2023, paper 11Multiple choice1 mark

  The complete combustion of $20{\mathrm{c}\mathrm{m}}^3$ of a gaseous alkane, X, requires $130{\mathrm{c}\mathrm{m}}^3$ of oxygen.

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• Question 32Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  Which row gives the correct names of the two compounds?

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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 32Oct/Nov 2023, paper 11Multiple choice1 mark

  Which compounds are in the same homologous series?

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• Question 33May/June 2026, paper 11Multiple choice1 mark

  Propane is an alkane that can react with chlorine. Which statement is correct?

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• Question 33Oct/Nov 2025, paper 11Multiple choice1 mark

  Which equation represents the reaction of ethane with chlorine in the presence of ultraviolet light?

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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 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 34Oct/Nov 2024, paper 11Multiple choice1 mark

  How many moles of oxygen are required for the complete combustion of 2 moles of ethanol?

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• Question 34Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  The displayed formulae of two organic compounds are shown. 1 $\mathrm{C}{\mathrm{H}}_3\mathrm{O}\mathrm{H}$ 2 $\mathrm{H}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$ What are the names of these compounds?

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• Question 35May/June 2026, paper 11Multiple choice1 markHas a diagram

  The displayed formula of an ester is shown. Which acid and which alcohol react to form this ester?

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• Question 35Oct/Nov 2025, paper 11Multiple choice1 mark

  Which statement about carboxylic acids 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 35Oct/Nov 2023, paper 11Multiple choice1 mark

  Two products of the separation of petroleum are the lubricating oil fraction and the kerosene / paraffin fraction. Which statement is correct?

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• Question 36May/June 2026, paper 11Multiple choice1 markHas a diagram

  Nylon and poly(ethene) are formed by polymerisation reactions. Which other products, if any, are formed during the two polymerisation reactions?

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• Question 36Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  The structures of X and Y are shown. What is the structure of the polymer formed when X and Y react together?

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• Question 36Oct/Nov 2023, paper 11Multiple choice1 mark

  An incomplete equation for the reaction of propane with chlorine is shown. $${\mathrm{C}}_3{\mathrm{H}}_8+\mathrm{C}{\mathrm{l}}_2\to {\mathrm{C}}_3{\mathrm{H}}_7\mathrm{C}\mathrm{l}+\mathrm{X}$$

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• Question 31May/June 2026, paper 12Multiple choice1 markHas a diagram

  The structures of three compounds are shown. Which compounds are structural isomers of each other?

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• Question 8Oct/Nov 2025, paper 12Multiple choice1 mark

  Which structure shows the carboxylic acid with the lowest relative molecular mass?

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• Question 34Oct/Nov 2024, paper 12Multiple choice1 mark

  How many different unbranched esters have the molecular formula ${\text{C}}_4{\text{H}}_8{\text{O}}_2$?

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• Question 37Oct/Nov 2023, paper 11Multiple choice1 mark

  Glycerol is an alcohol with three $-\mathrm{O}\mathrm{H}$ groups per molecule. What is the equation for the combustion of glycerol?

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• Question 32May/June 2026, paper 12Multiple choice1 mark

  X and Y are hydrocarbons obtained from the fractional distillation of petroleum. Their molecular formulae are shown. X: ${\text{C}}_{18}{\text{H}}_{38}$ Y: ${\text{C}}_8{\text{H}}_{18}$ Three statements are listed.

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