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Aldehydes and ketones: Eduqas A‑Level Chemistry questions

Every Eduqas A-Level Chemistry exam question on OA2.2 Aldehydes and ketones, 2016–2025, with its mark scheme and examiner’s report.

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1,513 questions

  1. Q6(a)

    June 2025 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2025 Component 2, question 6(a): State the name of the reaction mechanism occurring in stage 1. [1]

  2. Q12(a)(i)

    June 2025 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2025 Component 2, question 12(a)(i): Wood residues contain pentose sugars, mainly xylose and arabinose. Both of these sugars are reducing agents and give a positive test with Fehling’s reagent. Sta

  3. Q12(a)(ii)

    June 2025 · Component 2

    2 marksOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2025 Component 2, question 12(a)(ii): Furfural behaves like benzaldehyde in many of its reactions. I. Suggest a reagent that will produce furan-2-carboxylic acid when reacted with furfural. Give any

  4. Q3(e)(i)

    June 2025 · Component 3

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2025 Component 3, question 3(e)(i): State a chemical test that will give a positive result for compounds K and L but not for N-propylbenzamide or compound M. [1] Reagent(s) Observation

  5. Q3(e)(iv)

    June 2025 · Component 3

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2025 Component 3, question 3(e)(iv): State a chemical test that will give a positive result for compound K but not for N-propylbenzamide or compounds M or L. [1] Reagent(s) Observation

  6. Q2

    June 2024 · Component 2

    2 marksOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 2: Give the structure of an isomer of formula C3H6O2 that produces a red precipitate with Fehling’s reagent. Give your reasoning. [2]

  7. Q8(f)

    June 2024 · Component 2

    3 marksOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 8(f): Complete the table below. Give the observations made, if any, when phenylethanal and phenylethanone are tested with the reagents shown. [3] phenylethanal phenyl

  8. Q9(d)(iii)

    June 2024 · Component 2

    2 marksC3.2 HydrocarbonsOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 9(d)(iii): Ozonolysis of compound T produced two different ketones. Explain what can be deduced about the structure of compound T from this statement. [2]

  9. Q9(d)(iv)

    June 2024 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 9(d)(iv): Both of the ketones produced by the ozonolysis reaction gave a positive triiodomethane reaction. Give the formula of the group that must be present in both of t

  10. Q9(f)

    June 2024 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 9(f): Draw the structure of the compound produced when compound Q reacts with excess sodium tetrahydridoborate, NaBH4 [1]

  11. Q11(a)(v)

    June 2024 · Component 2

    4 marksOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 2, question 11(a)(v): Prop-2-enal reacts with hydrogen cyanide to give compound W. The mechanism for this reaction is similar to the reaction of ethanal and hydrogen cyanide. I. Comp

  12. Q4(d)(ii)

    June 2024 · Component 3

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 3, question 4(d)(ii): State a chemical test that will give a positive result for compound C but not for compound A. Give the reagent(s) and observation. [1] Reagent(s) Observation

  13. Q4(d)(iii)

    June 2024 · Component 3

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    June 2024 Component 3, question 4(d)(iii): State a chemical test that will give a positive result for N-phenylethanamide and compound A, but not for compounds B and C. Give the reagent(s) and observation

  14. Q7(b)(ii)

    Autumn 2021 · Component 2

    4 marksOA2.2 Aldehydes and ketonesC3.5 Instrumental analysis
    The whole paper ↗
    Autumn 2021 Component 2, question 7(b)(ii): Cyclohexanone is then converted to Nylon-6 in a three-stage process. OH O N O NH2OH acid water / 500 K NH Nylon-6 acid increased pressure cyclohexanone caprolac

  15. Q8(d)

    Autumn 2021 · Component 2

    2 marksOA2.2 Aldehydes and ketones
    The whole paper ↗
    Autumn 2021 Component 2, question 8(d): Phenyl methanoate also has the molecular formula C7H6O2 Give the structure of this compound and use it to explain why it is likely to give a silver mirror when

  16. Q2(f)(iii)

    Autumn 2021 · Component 3

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    Autumn 2021 Component 3, question 2(f)(iii): Name the functional group in compound F, identified by the positive test with Fehling’s solution.  [1]

  17. Q1

    Autumn 2020 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    Autumn 2020 Component 2, question 1: Give the structure of a compound containing four carbon atoms that will give a red precipitate with Fehling’s reagent. [1]

  18. Q3(a)

    Autumn 2020 · Component 2

    1 markOA2.2 Aldehydes and ketones
    The whole paper ↗
    Autumn 2020 Component 2, question 3(a): State which one of the compounds can be reduced by sodium tetrahydridoborate(III). [1]

  19. Q3(b)

    Autumn 2020 · Component 2

    3 marksOA2.2 Aldehydes and ketonesC3.4 Alcohols and carboxylic acids
    The whole paper ↗
    Autumn 2020 Component 2, question 3(b): Complete each box in the table by giving an observation. If there is no observation, write ‘no reaction’. [3] Reagent added Compound Aqueous sodium Acidified po

  20. Q8(a)

    Autumn 2020 · Component 2

    6 marksOA4 Organic synthesis and analysisOA2.2 Aldehydes and ketones
    The whole paper ↗
    Autumn 2020 Component 2, question 8(a): A perfume contains 2-methylundecanal, C12H24O. O CH3(CH2)8CH(CH3)C H Compounds D to G all contain some features similar to 2-methylundecanal. For each compound
All 37 questions on Aldehydes and ketones, as a list
  1. June 2025, Component 2, Q6(a) (1 mark): State the name of the reaction mechanism occurring in stage 1. [1]
  2. June 2025, Component 2, Q12(a)(i) (1 mark): Wood residues contain pentose sugars, mainly xylose and arabinose. Both of these sugars are reducing agents and give a positive test with Fehling’s reagent. Sta
  3. June 2025, Component 2, Q12(a)(ii) (2 marks): Furfural behaves like benzaldehyde in many of its reactions. I. Suggest a reagent that will produce furan-2-carboxylic acid when reacted with furfural. Give any
  4. June 2025, Component 3, Q3(e)(i) (1 mark): State a chemical test that will give a positive result for compounds K and L but not for N-propylbenzamide or compound M. [1] Reagent(s) Observation
  5. June 2025, Component 3, Q3(e)(iv) (1 mark): State a chemical test that will give a positive result for compound K but not for N-propylbenzamide or compounds M or L. [1] Reagent(s) Observation
  6. June 2024, Component 2, Q2 (2 marks): Give the structure of an isomer of formula C3H6O2 that produces a red precipitate with Fehling’s reagent. Give your reasoning. [2]
  7. June 2024, Component 2, Q8(f) (3 marks): Complete the table below. Give the observations made, if any, when phenylethanal and phenylethanone are tested with the reagents shown. [3] phenylethanal phenyl
  8. June 2024, Component 2, Q9(d)(iii) (2 marks): Ozonolysis of compound T produced two different ketones. Explain what can be deduced about the structure of compound T from this statement. [2]
  9. June 2024, Component 2, Q9(d)(iv) (1 mark): Both of the ketones produced by the ozonolysis reaction gave a positive triiodomethane reaction. Give the formula of the group that must be present in both of t
  10. June 2024, Component 2, Q9(f) (1 mark): Draw the structure of the compound produced when compound Q reacts with excess sodium tetrahydridoborate, NaBH4 [1]
  11. June 2024, Component 2, Q11(a)(v) (4 marks): Prop-2-enal reacts with hydrogen cyanide to give compound W. The mechanism for this reaction is similar to the reaction of ethanal and hydrogen cyanide. I. Comp
  12. June 2024, Component 3, Q4(d)(ii) (1 mark): State a chemical test that will give a positive result for compound C but not for compound A. Give the reagent(s) and observation. [1] Reagent(s) Observation
  13. June 2024, Component 3, Q4(d)(iii) (1 mark): State a chemical test that will give a positive result for N-phenylethanamide and compound A, but not for compounds B and C. Give the reagent(s) and observation
  14. Autumn 2021, Component 2, Q7(b)(ii) (4 marks): Cyclohexanone is then converted to Nylon-6 in a three-stage process. OH O N O NH2OH acid water / 500 K NH Nylon-6 acid increased pressure cyclohexanone caprolac
  15. Autumn 2021, Component 2, Q8(d) (2 marks): Phenyl methanoate also has the molecular formula C7H6O2 Give the structure of this compound and use it to explain why it is likely to give a silver mirror when
  16. Autumn 2021, Component 3, Q2(f)(iii) (1 mark): Name the functional group in compound F, identified by the positive test with Fehling’s solution.  [1]
  17. Autumn 2020, Component 2, Q1 (1 mark): Give the structure of a compound containing four carbon atoms that will give a red precipitate with Fehling’s reagent. [1]
  18. Autumn 2020, Component 2, Q3(a) (1 mark): State which one of the compounds can be reduced by sodium tetrahydridoborate(III). [1]
  19. Autumn 2020, Component 2, Q3(b) (3 marks): Complete each box in the table by giving an observation. If there is no observation, write ‘no reaction’. [3] Reagent added Compound Aqueous sodium Acidified po
  20. Autumn 2020, Component 2, Q8(a) (6 marks): A perfume contains 2-methylundecanal, C12H24O. O CH3(CH2)8CH(CH3)C H Compounds D to G all contain some features similar to 2-methylundecanal. For each compound
  21. June 2019, Component 2, Q1(a) (1 mark): State the type of reaction mechanism taking place when hydrogen cyanide reacts with pentan-3-one. [1]
  22. June 2019, Component 2, Q4 (2 marks): A colourless solution contains either benzoic acid or 2-hydroxybenzaldehyde, C6H4(OH)CHO. State two chemical tests, apart from using indicator paper, which can
  23. June 2019, Component 2, Q11(c)(i) (1 mark): Give the structure of the compound obtained when compound W reacts with sodium tetrahydridoborate(III), NaBH4 [1]
  24. June 2019, Component 2, Q11(c)(ii) (2 marks): Compound W is warmed with Tollens’ reagent. Describe what is seen (if anything) and explain your observation. [2]
  25. June 2019, Component 2, Q13(b)(iii) (2 marks): 2-Methylhept-2-en-6-one gives a positive triiodomethane test. State the reagent(s) used for this test and the observation. [2] Reagent(s) ……… Observation ………
  26. June 2019, Component 2, Q13(b)(iv) (2 marks): The reaction of 2-methylhept-2-en-6-one with aqueous sodium tetrahydridoborate(III) results in the formation of a new compound which has forms that rotate the p
  27. June 2019, Component 3, Q5(b) (1 mark): Explain the results observed for compound F. [1]
  28. June 2019, Component 3, Q5(d)(iii) (1 mark): Give a chemical test which gives a positive result for compound J but not for compounds B, H and I. [1] Reagent(s) ……… Observation(s) …
  29. June 2018, Component 2, Q3 (1 mark): The compound below is reduced by sodium tetrahydridoborate(III). State, giving a reason, whether a primary, secondary or tertiary alcohol is produced. [1] O
  30. June 2018, Component 2, Q10(a) (2 marks): The formula of glucose can be written as an open-chain formula. H HO H H O C C C C C CH2OH H OH H OH OH Glucose is a reducing sugar and will react with Fehling’
  31. June 2018, Component 2, Q11(b)(i) (1 mark): Give the skeletal formula of compound F. [1]
  32. June 2018, Component 3, Q2(b) (2 marks): Describe a test that would give a positive result for butan-2-ol (alcohol B) but not for alcohols A, C and D. Give the name of the reagent(s) used and the obser
  33. June 2017, Component 2, Q4(b) (2 marks): A by-product of this reaction was a compound with a relative molecular mass of 150. This compound was able to reduce Fehling’s solution. Suggest a displayed for
  34. June 2017, Component 2, Q11(a)(ii) (2 marks): When dihydrofuran is heated, ring opening occurs giving but-2-enal as one of the products. O CH3CH CH C O H The reaction products were treated with a solution o
  35. June 2017, Component 2, Q11(b)(i) (1 mark): Suggest an alternative product that might form when but-2-enal is reduced in stage 1 [1]
  36. June 2017, Component 2, Q11(b)(iii) (1 mark): State the type of reaction mechanism occurring during stage 2 [1]
  37. June 2017, Component 2, Q13(b) (2 marks): Glucose, like 2,3-dihydroxypropanal, contains an aldehyde group. Fehling’s / Benedict’s solutions are used to show the presence of an aldehyde. Describe another

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