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Introduction to organic chemistry: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.3.1 Introduction to organic chemistry, 2016–2025, with its mark scheme and examiner’s report.

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2,301 questions

  1. Q02.1

    June 2025 · Paper 2

    3 marks3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 Paper 2, question 02.1: Use IUPAC rules to name L. Explain why L exists as stereoisomers. [3 marks] Name Explanation

  2. Q02.2

    June 2025 · Paper 2

    2 marks3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 Paper 2, question 02.2: Compound M has the same carbon chain as L but the double bond is in a different position. M also exists as stereoisomers. Draw the structural formula of M. Expl

  3. Q06.1

    June 2025 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 Paper 3, question 06.1: State the type of stereoisomerism shown in Branch A. [1 mark]

  4. Q06.2

    June 2025 · Paper 3

    3 marks3.3.9 Carboxylic acids and derivatives3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 Paper 3, question 06.2: Q can be reacted with methanol to form three different esters. State the number used to identify the position of the C=C bond in the name of the ester formed fr

  5. Q18

    June 2025 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 Paper 3, question 18: What is the correct structural formula for 4-chloro-2-methylpent-2-enoic acid? [1 mark] A CH3CCl=CHCH(CH3)COOH B (CH3)2C=CHCHClCOOH C CH3CHClCH=C(CH3)COOH D (CH

  6. Q04.1

    June 2025 · AS Paper 2

    2 marks3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 AS Paper 2, question 04.1: Compounds A and B • each have the molecular formula C4H6O2 • are functional group isomers of each other • each react with sodium carbonate to form a gas. Compou

  7. Q08

    June 2025 · AS Paper 2

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 AS Paper 2, question 08: What is the name of this compound according to IUPAC rules? [1 mark] A 2-methylbutanal B 3-methylbutanal C 2-methylbutan-1-one D 3-methylbutan-1-one

  8. Q12

    June 2025 · AS Paper 2

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2025 AS Paper 2, question 12: What is the name of this compound according to IUPAC rules? [1 mark] A E–3-fluoro-2-methylpent-3-ene B Z–3-fluoro-2-methylpent-4-ene C E–3-fluoro-4-methylpent-2

  9. Q03.5

    June 2024 · Paper 3

    2 marks3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 Paper 3, question 03.5: 2-Methylpent-4-en-2-ol decomposes in a similar way to but-3-en-1-ol, to produce an alkene and a carbonyl compound. Deduce the structures of the alkene and the c

  10. Q23

    June 2024 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 Paper 3, question 23: What is the correct structural formula for 4-chloro-2-methylpent-2-enoic acid? [1 mark] A CH3CCl=CHCH(CH3)COOH B (CH3)2C=CHCHClCOOH C CH3CHClCH=C(CH3)COOH D (CH

  11. Q25

    June 2024 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 Paper 3, question 25: Compound Y has the structural formula CH3COOCH2CH(CH3)2 Which compound is a position isomer of Y? [1 mark] A 5-hydroxyhexan-3-one B butyl ethanoate C hexanoic a

  12. Q26

    June 2024 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 Paper 3, question 26: Which compound shows E–Z isomerism? [1 mark] A 2,3-dimethylbut-1-ene B 2,3-dimethylbut-2-ene C 2-methylpent-2-ene D 3-methylpent-2-ene

  13. Q03.1

    June 2024 · AS Paper 2

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 AS Paper 2, question 03.1: Use IUPAC rules to name CFCl3 [1 mark]

  14. Q04.1

    June 2024 · AS Paper 2

    6 marks3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2024 AS Paper 2, question 04.1: Compound J is one of a pair of stereoisomers. Explain: • what stereoisomers are • how E-Z stereoisomerism occurs • how the Cahn-Ingold-Prelog rules can be used

  15. Q04.1

    June 2023 · Paper 2

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2023 Paper 2, question 04.1: Use IUPAC rules to name isomer W. [1 mark]

  16. Q09.1

    June 2023 · Paper 2

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2023 Paper 2, question 09.1: Ethenone is the simplest member of the ketene homologous series. Ketenes all contain one C=C double bond and one C=O double bond. Deduce the general formula for

  17. Q02.1

    June 2023 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry3.3.5 Alcohols
    The whole paper ↗
    June 2023 Paper 3, question 02.1: Draw the displayed formula of an unbranched position isomer of pentan-2-ol that can be dehydrated to form a single alkene. [1 mark]

  18. Q02.2

    June 2023 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry3.3.5 Alcohols
    The whole paper ↗
    June 2023 Paper 3, question 02.2: Draw the skeletal formula of a chain isomer of pentan-2-ol that can be dehydrated to form a mixture of alkenes. [1 mark]

  19. Q02.3

    June 2023 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry
    The whole paper ↗
    June 2023 Paper 3, question 02.3: Draw the structure of an unbranched functional group isomer of pentan-2-ol. [1 mark]

  20. Q02.4

    June 2023 · Paper 3

    1 mark3.3.1 Introduction to organic chemistry3.3.5 Alcohols
    The whole paper ↗
    June 2023 Paper 3, question 02.4: Another isomer of pentan-2-ol is an alcohol that is not dehydrated when heated with concentrated sulfuric acid. Draw the structure of this isomer. [1 mark]
All 64 questions on Introduction to organic chemistry, as a list
  1. June 2025, Paper 2, Q02.1 (3 marks): Use IUPAC rules to name L. Explain why L exists as stereoisomers. [3 marks] Name Explanation
  2. June 2025, Paper 2, Q02.2 (2 marks): Compound M has the same carbon chain as L but the double bond is in a different position. M also exists as stereoisomers. Draw the structural formula of M. Expl
  3. June 2025, Paper 3, Q06.1 (1 mark): State the type of stereoisomerism shown in Branch A. [1 mark]
  4. June 2025, Paper 3, Q06.2 (3 marks): Q can be reacted with methanol to form three different esters. State the number used to identify the position of the C=C bond in the name of the ester formed fr
  5. June 2025, Paper 3, Q18 (1 mark): What is the correct structural formula for 4-chloro-2-methylpent-2-enoic acid? [1 mark] A CH3CCl=CHCH(CH3)COOH B (CH3)2C=CHCHClCOOH C CH3CHClCH=C(CH3)COOH D (CH
  6. June 2025, AS Paper 2, Q04.1 (2 marks): Compounds A and B • each have the molecular formula C4H6O2 • are functional group isomers of each other • each react with sodium carbonate to form a gas. Compou
  7. June 2025, AS Paper 2, Q08 (1 mark): What is the name of this compound according to IUPAC rules? [1 mark] A 2-methylbutanal B 3-methylbutanal C 2-methylbutan-1-one D 3-methylbutan-1-one
  8. June 2025, AS Paper 2, Q12 (1 mark): What is the name of this compound according to IUPAC rules? [1 mark] A E–3-fluoro-2-methylpent-3-ene B Z–3-fluoro-2-methylpent-4-ene C E–3-fluoro-4-methylpent-2
  9. June 2024, Paper 3, Q03.5 (2 marks): 2-Methylpent-4-en-2-ol decomposes in a similar way to but-3-en-1-ol, to produce an alkene and a carbonyl compound. Deduce the structures of the alkene and the c
  10. June 2024, Paper 3, Q23 (1 mark): What is the correct structural formula for 4-chloro-2-methylpent-2-enoic acid? [1 mark] A CH3CCl=CHCH(CH3)COOH B (CH3)2C=CHCHClCOOH C CH3CHClCH=C(CH3)COOH D (CH
  11. June 2024, Paper 3, Q25 (1 mark): Compound Y has the structural formula CH3COOCH2CH(CH3)2 Which compound is a position isomer of Y? [1 mark] A 5-hydroxyhexan-3-one B butyl ethanoate C hexanoic a
  12. June 2024, Paper 3, Q26 (1 mark): Which compound shows E–Z isomerism? [1 mark] A 2,3-dimethylbut-1-ene B 2,3-dimethylbut-2-ene C 2-methylpent-2-ene D 3-methylpent-2-ene
  13. June 2024, AS Paper 2, Q03.1 (1 mark): Use IUPAC rules to name CFCl3 [1 mark]
  14. June 2024, AS Paper 2, Q04.1 (6 marks): Compound J is one of a pair of stereoisomers. Explain: • what stereoisomers are • how E-Z stereoisomerism occurs • how the Cahn-Ingold-Prelog rules can be used
  15. June 2023, Paper 2, Q04.1 (1 mark): Use IUPAC rules to name isomer W. [1 mark]
  16. June 2023, Paper 2, Q09.1 (1 mark): Ethenone is the simplest member of the ketene homologous series. Ketenes all contain one C=C double bond and one C=O double bond. Deduce the general formula for
  17. June 2023, Paper 3, Q02.1 (1 mark): Draw the displayed formula of an unbranched position isomer of pentan-2-ol that can be dehydrated to form a single alkene. [1 mark]
  18. June 2023, Paper 3, Q02.2 (1 mark): Draw the skeletal formula of a chain isomer of pentan-2-ol that can be dehydrated to form a mixture of alkenes. [1 mark]
  19. June 2023, Paper 3, Q02.3 (1 mark): Draw the structure of an unbranched functional group isomer of pentan-2-ol. [1 mark]
  20. June 2023, Paper 3, Q02.4 (1 mark): Another isomer of pentan-2-ol is an alcohol that is not dehydrated when heated with concentrated sulfuric acid. Draw the structure of this isomer. [1 mark]
  21. June 2023, AS Paper 2, Q02.3 (1 mark): 3-Ethyl-4-methylhexane is a branched alkane in petrol. Draw the skeletal formula of this alkane. [1 mark]
  22. June 2023, AS Paper 2, Q18 (1 mark): Which is the IUPAC name for this compound? [1 mark] A E-3-fluorohex-3-ene B E-4-fluorohex-3-ene C Z-3-fluorohex-3-ene D Z-4-fluorohex-3-ene
  23. June 2022, Paper 2, Q01.1 (2 marks): Draw the displayed formula for CH3CH2COCH2I Give the name of CH3CH2COCH2I [2 marks] Displayed formula Name
  24. June 2022, Paper 2, Q03.3 (1 mark): Draw the skeletal formula of a functional group isomer of 2-methylbut-1-ene. [1 mark]
  25. June 2022, Paper 3, Q03.2 (2 marks): Define the term stereoisomers. [2 marks]
  26. June 2022, Paper 3, Q03.3 (2 marks): Deduce the name of isomer A. Explain why A does not exhibit stereoisomerism. [2 marks] Name Explanation
  27. June 2022, Paper 3, Q03.5 (2 marks): Deduce the name of isomer B and the name of isomer C. Explain the origin of the stereoisomerism in B and C. [2 marks] Names Explanation
  28. June 2022, AS Paper 2, Q03.1 (1 mark): Draw the displayed formula of a position isomer of hex-2-ene that exists as E and Z isomers. [1 mark]
  29. June 2022, AS Paper 2, Q03.2 (1 mark): Draw the displayed formula of a chain isomer of hex-2-ene that does not exist as E and Z isomers. [1 mark] Butanal has the molecular formula C4H8O
  30. June 2022, AS Paper 2, Q03.3 (1 mark): Draw the skeletal formula of a functional group isomer of butanal that has an absorption in the range 1680–1750 cm–1 in its infrared spectrum. [1 mark]
  31. June 2022, AS Paper 2, Q03.4 (1 mark): Draw the skeletal formula of a structural isomer of butanal that has an absorption in the range 3230–3550 cm–1 in its infrared spectrum. [1 mark]
  32. June 2022, AS Paper 2, Q03.5 (4 marks): Several saturated halogenoalkanes contain 17.8% carbon, 3.0% hydrogen and 79.2% bromine by mass. Calculate the empirical formula of these compounds. Give the IU
  33. November 2021, Paper 2, Q06.3 (2 marks): Draw the E and Z forms of a structural isomer of C5H10O that shows both optical and geometric isomerism. [2 marks] E isomer Z isomer
  34. November 2021, Paper 3, Q23 (1 mark): Which compound has E–Z isomers? [1 mark] A CH2=CHBr B CH2=CBr2 C CHBr=CHBr D CBr2=CHBr
  35. November 2021, Paper 3, Q27 (1 mark): Which is the correct general formula for non-cyclic compounds in the homologous series? [1 mark] A alcohols CnH2n+2O B aldehydes CnH2n+1O C esters CnH2n+1O2 D p
  36. November 2021, AS Paper 2, Q04.1 (1 mark): The molecule CFC-11 was commonly used as a refrigerant. Use IUPAC rules to name CFC-11 [1 mark]
  37. November 2021, AS Paper 2, Q09 (1 mark): Which alkene shows E–Z isomerism? [1 mark] A 2,3-dimethylbut-2-ene B 4-methylpent-2-ene C methylpropene D pent-1-ene
  38. November 2021, AS Paper 2, Q17 (1 mark): Which compound has a molecular formula that is different from the others? [1 mark] A B C D
  39. November 2020, Paper 2, Q02.2 (1 mark): Identify the functional group(s) in the prilocaine molecule. [1 mark]
  40. November 2020, Paper 2, Q03.4 (1 mark): State the type of structural isomerism shown by isomers P, Q, R and S. [1 mark]
  41. November 2020, Paper 2, Q08.3 (1 mark): Complete this IUPAC name for H3Y [1 mark] propane-1, 2, 3-tricarboxylic acid
  42. November 2020, Paper 3, Q22 (1 mark): Which has E-Z isomers? [1 mark] A C2H2Br2 B C2H3Br C C2H4Br2 D C2H5Br
  43. November 2020, AS Paper 2, Q05 (6 marks): Explain the differences between structural isomerism and stereoisomerism. Use examples to show how compounds with the molecular formula C4H8 exhibit stereoisome
  44. November 2020, AS Paper 2, Q11 (1 mark): What is the IUPAC name for this compound? [1 mark] A 2-dimethyl-3-fluoropentane B 2,2-dimethyl-3-fluoropentane C 3-fluoro-2,2-dimethylpentane D 3-fluoro-2-dimet
  45. June 2019, Paper 2, Q07.1 (1 mark): Give the IUPAC name for isomer X. [1 mark]
  46. June 2019, AS Paper 2, Q13 (1 mark): Which compound is not an isomer of the following compound? [1 mark] A CH3CH2COCH3 B CH3CH═CHCH2OH C (CH3)2CHCHO D CH2═CHCH2CHO
  47. June 2019, AS Paper 2, Q14 (1 mark): How many isomers are there of C3H9N? [1 mark] A 2 B 3 C 4 D 5
  48. June 2018, Paper 2, Q02.1 (1 mark): Give the IUPAC name for CH2(OH)CH(CH3)CH2Br [1 mark]
  49. June 2018, AS Paper 2, Q06.1 (1 mark): Name Compound A. [1 mark]
  50. June 2018, AS Paper 2, Q15 (1 mark): How many structural isomers with an unbranched carbon chain have the molecular formula C4H8Br2? [1 mark] A 4 B 5 C 6 D 7
  51. June 2017, Paper 2, Q10.1 (1 mark): Give the full IUPAC name of isomer P. [1 mark
  52. June 2017, Paper 3, Q24 (1 mark): Which compound does not show stereoisomerism? [1 mark] A 1,2-dichloropropene B 1,2-dichloropropane C 1,3-dichloropropene D 1,3-dichloropropane
  53. June 2017, AS Paper 2, Q03.1 (6 marks): Compounds A, B and C all have the molecular formula C5H10 A and B decolourise bromine water but C does not. B exists as two stereoisomers but A does not show st
  54. June 2017, AS Paper 2, Q08.1 (1 mark): Draw the skeletal formula of 3-methylbutanal. [1 mark]
  55. June 2017, AS Paper 2, Q14 (1 mark): Which compound is a structural isomer of Z-but-2-ene? [1 mark] A butane B E-but-2-ene C cyclobutane D methylbut-2-ene
  56. June 2017, AS Paper 2, Q18 (1 mark): How many structural isomers are there with the molecular formula C3H6BrCl? [1 mark] A 4 B 5 C 6 D 7
  57. June 2016, AS Paper 2, Q03.1 (1 mark): Give the IUPAC name for isooctane. [1 mark]
  58. June 2016, AS Paper 2, Q07.1 (1 mark): The alkene 3-methylpent-2-ene (CH3CH=C(CH3)CH2CH3) exists as E and Z stereoisomers. Draw the structure of Z-3-methylpent-2-ene. [1 mark]
  59. June 2016, AS Paper 2, Q18 (1 mark): The structure of cyclohexene is shown. Which of the following is the general formula of cyclic alkenes such as cyclohexene? [1 mark] A CnH2n-4 B CnH2n-2 C CnH2n
  60. Specimen, Paper 2, Q03.1 (1 mark): 3 Isooctane (C8H18) is the common name for the branched-chain hydrocarbon that burns smoothly in car engines. The skeletal formula of isooctane is shown in Figu
  61. Specimen, Paper 2, Q04.1 (1 mark): 4 Alcohol A (CH3)2CHCH(OH)CH3 undergoes reactions separately with acidified potassium dichromate(VI) and with concentrated sulfuric acid. Deduce the IUPAC name
  62. Specimen, Paper 2, Q04.5 (1 mark): Name the type of structural isomerism shown by C and D. [1 mark] 0 4 . 5
  63. Specimen, Paper 3, Q24: How many isomers have the molecular formula C5H12? [1 mar A 2 B 3 C 4 D 5 2 4
  64. Specimen, Paper 3, Q26 (1 mark): How many structural isomers have the molecular formula C4H9Br? [1 mark] A 2 B 3 C 4 D 5 2 6

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