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Organic functional groups: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on CD Organic functional groups (specification points CD(c)–(f)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q2(b)(i)

    June 2025 · Paper 3

    6 marksCD Organic functional groupsPL Polymers
    The whole paper ↗
    June 2025 Paper 3, question 2(b)(i): Explain, in terms of bond lengths, why structure A is a less accurate representation than structure B. [2]

  2. Q2(b)(ii)

    June 2025 · Paper 3

    6 marksCD Organic functional groups
    The whole paper ↗
    June 2025 Paper 3, question 2(b)(ii): The aromatic rings in styrene are stabilised by delocalisation. Explain what delocalisation means. [2] 8 (d) Styrene can be o xidised to benzoic acid. Compound

  3. Q35(f)

    June 2024 · Paper 1

    6 marksCD Organic functional groups
    The whole paper ↗
    June 2024 Paper 1, question 35(f): Acid orange is a soluble azo dye that can be made from benzene by the following route: Reaction 1 Reaction 2 SO3H O2N SO3H nitration benzene compound C Reaction

  4. Q3(c)

    June 2023 · Paper 3

    6 marksCD Organic functional groups
    The whole paper ↗
    June 2023 Paper 3, question 3(c): Indigo is a natural blue dye that can be extracted from various plants. O H N N H O Indigo (c)* Benzene rings in dyes are usually represented as shown in Fig. 3

  5. Q17

    June 2022 · Paper 1

    1 markCD Organic functional groups
    The whole paper ↗
    June 2022 Paper 1, question 17: The Kekulé structure of benzene (C6H6) is shown below. What is a correct statement about benzene if the Kekulé structure represented the actual structure and bo

  6. Q3(b)

    November 2021 · Paper 2

    2 marksCD Organic functional groups
    The whole paper ↗
    November 2021 Paper 2, question 3(b): Benzaldehyde has a benzene ring. The benzene ring has delocalised electrons. Describe how the delocalised electrons are arranged in the benzene structure. [2]

  7. Q3(c)

    November 2021 · Paper 2

    1 markCD Organic functional groups
    The whole paper ↗
    November 2021 Paper 2, question 3(c): Benzene and ethene each undergo electrophilic reactions. State how these reactions differ. [1]

  8. Q30

    November 2020 · Paper 1

    1 markCD Organic functional groups
    The whole paper ↗
    November 2020 Paper 1, question 30: Benzene can be represented as structure V or as structure W as shown below. structure V structure W Which of the following statement(s) is/are evidence for stru

  9. Q33(d)

    November 2020 · Paper 1

    6 marksCD Organic functional groups
    The whole paper ↗
    November 2020 Paper 1, question 33(d): Chloroethene is made in an industrial cracking reaction and is the monomer for making poly(chloroethene). Chloroethene can be made from ethene in two steps: Ste

  10. Q4(a)(i)

    November 2020 · Paper 2

    2 marksCD Organic functional groups
    The whole paper ↗
    November 2020 Paper 2, question 4(a)(i): Describe chemical tests that can be carried out in a laboratory to identify the two functional groups in both acids. [2]

  11. Q35(d)(ii)

    June 2019 · Paper 1

    1 markCD Organic functional groups
    The whole paper ↗
    June 2019 Paper 1, question 35(d)(ii): Draw a skeletal formula for the unsaturated aromatic compound B. [1]

  12. Q2(a)

    June 2019 · Paper 3

    2 marksCD Organic functional groups
    The whole paper ↗
    June 2019 Paper 3, question 2(a): Identify the two functional groups in paracetamol, apart from the benzene ring. 1 2 [2]

  13. Q29

    June 2018 · Paper 1

    1 markCD Organic functional groups
    The whole paper ↗
    June 2018 Paper 1, question 29: Which statement/s is/are a result of delocalisation in benzene? 1 Benzene undergoes substitution reactions. 2 Benzene reacts faster with bromine than alkenes do

  14. Q30

    June 2018 · Paper 1

    1 markCD Organic functional groups
    The whole paper ↗
    June 2018 Paper 1, question 30: Kekulé represented benzene as: Which statement/s follow/s from this structure? 1 All the carbon-carbon bonds are of equal length in benzene. 2 The C–C–C bond an

  15. Q2(e)(i)

    June 2018 · Paper 2

    3 marksCD Organic functional groups
    The whole paper ↗
    June 2018 Paper 2, question 2(e)(i): Explain how the enthalpy change of hydrogenation of cyclohexene is used to give evidence for the bonding in the benzene molecule. [3]

  16. Q2(e)(ii)

    June 2018 · Paper 2

    6 marksCD Organic functional groups
    The whole paper ↗
    June 2018 Paper 2, question 2(e)(ii): Propene gas, C3H6, is obtained industrially from a variety of sources. Propene is mainly used as a starting material for making polymers. (ii)* Cyclohexene and

  17. Q34(a)(i)

    June 2017 · Paper 1

    4 marksCD Organic functional groups
    The whole paper ↗
    June 2017 Paper 1, question 34(a)(i): Compare and explain the bond angles and bond lengths predicted by each structure. Bond angles Bond lengths [4]

  18. Q34(a)(ii)

    June 2017 · Paper 1

    2 marksCD Organic functional groups
    The whole paper ↗
    June 2017 Paper 1, question 34(a)(ii): The equation below shows the hydrogenation of cyclohexene. rH = – 120 kJ mol–1 + H2 When benzene is reacted with hydrogen to form cyclohexane the enthalpy chang
All 18 questions on Organic functional groups, as a list
  1. June 2025, Paper 3, Q2(b)(i) (6 marks): Explain, in terms of bond lengths, why structure A is a less accurate representation than structure B. [2]
  2. June 2025, Paper 3, Q2(b)(ii) (6 marks): The aromatic rings in styrene are stabilised by delocalisation. Explain what delocalisation means. [2] 8 (d) Styrene can be o xidised to benzoic acid. Compound
  3. June 2024, Paper 1, Q35(f) (6 marks): Acid orange is a soluble azo dye that can be made from benzene by the following route: Reaction 1 Reaction 2 SO3H O2N SO3H nitration benzene compound C Reaction
  4. June 2023, Paper 3, Q3(c) (6 marks): Indigo is a natural blue dye that can be extracted from various plants. O H N N H O Indigo (c)* Benzene rings in dyes are usually represented as shown in Fig. 3
  5. June 2022, Paper 1, Q17 (1 mark): The Kekulé structure of benzene (C6H6) is shown below. What is a correct statement about benzene if the Kekulé structure represented the actual structure and bo
  6. November 2021, Paper 2, Q3(b) (2 marks): Benzaldehyde has a benzene ring. The benzene ring has delocalised electrons. Describe how the delocalised electrons are arranged in the benzene structure. [2]
  7. November 2021, Paper 2, Q3(c) (1 mark): Benzene and ethene each undergo electrophilic reactions. State how these reactions differ. [1]
  8. November 2020, Paper 1, Q30 (1 mark): Benzene can be represented as structure V or as structure W as shown below. structure V structure W Which of the following statement(s) is/are evidence for stru
  9. November 2020, Paper 1, Q33(d) (6 marks): Chloroethene is made in an industrial cracking reaction and is the monomer for making poly(chloroethene). Chloroethene can be made from ethene in two steps: Ste
  10. November 2020, Paper 2, Q4(a)(i) (2 marks): Describe chemical tests that can be carried out in a laboratory to identify the two functional groups in both acids. [2]
  11. June 2019, Paper 1, Q35(d)(ii) (1 mark): Draw a skeletal formula for the unsaturated aromatic compound B. [1]
  12. June 2019, Paper 3, Q2(a) (2 marks): Identify the two functional groups in paracetamol, apart from the benzene ring. 1 2 [2]
  13. June 2018, Paper 1, Q29 (1 mark): Which statement/s is/are a result of delocalisation in benzene? 1 Benzene undergoes substitution reactions. 2 Benzene reacts faster with bromine than alkenes do
  14. June 2018, Paper 1, Q30 (1 mark): Kekulé represented benzene as: Which statement/s follow/s from this structure? 1 All the carbon-carbon bonds are of equal length in benzene. 2 The C–C–C bond an
  15. June 2018, Paper 2, Q2(e)(i) (3 marks): Explain how the enthalpy change of hydrogenation of cyclohexene is used to give evidence for the bonding in the benzene molecule. [3]
  16. June 2018, Paper 2, Q2(e)(ii) (6 marks): Propene gas, C3H6, is obtained industrially from a variety of sources. Propene is mainly used as a starting material for making polymers. (ii)* Cyclohexene and
  17. June 2017, Paper 1, Q34(a)(i) (4 marks): Compare and explain the bond angles and bond lengths predicted by each structure. Bond angles Bond lengths [4]
  18. June 2017, Paper 1, Q34(a)(ii) (2 marks): The equation below shows the hydrogenation of cyclohexene. rH = – 120 kJ mol–1 + H2 When benzene is reacted with hydrogen to form cyclohexane the enthalpy chang

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