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Bonding and structure: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on CD Bonding and structure (specification points CD(a)–(b)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q4(e)(i)

    June 2025 · Paper 2

    2 marksCD Bonding and structure
    The whole paper ↗
    June 2025 Paper 2, question 4(e)(i): Acid dyes have –SO3 conditions. Explain how this occurs. [2]

  2. Q35(e)(i)

    June 2024 · Paper 1

    1 markCD Bonding and structure
    The whole paper ↗
    June 2024 Paper 1, question 35(e)(i): Draw a ring around the chromophore of acid orange. OH N = N SO3Na acid orange [1]

  3. Q35(e)(ii)

    June 2024 · Paper 1

    1 markCD Bonding and structure
    The whole paper ↗
    June 2024 Paper 1, question 35(e)(ii): One part of its structure makes acid orange more soluble than many other azo dyes. Give the formula of this part. [1]

  4. Q3(a)(ii)

    June 2023 · Paper 3

    1 markCD Bonding and structure
    The whole paper ↗
    June 2023 Paper 3, question 3(a)(ii): Indigo is used to dye cotton. The cotton structure has many –OH groups. Suggest the strongest type of intermolecular bond that binds indigo to cotton. [1]

  5. Q18

    June 2022 · Paper 1

    1 markCD Bonding and structure
    The whole paper ↗
    June 2022 Paper 1, question 18: A dye molecule is shown below. HO N N What is correct about this dye molecule? A Delocalisation extends over the whole dye molecule. B The dye molecule will att

  6. Q29

    November 2021 · Paper 1

    1 markCD Bonding and structure
    The whole paper ↗
    November 2021 Paper 1, question 29: The molecule below is an orange dye. N HO N Which group(s), when attached to a benzene ring in the dye, could change its colour? 1 OH 2 NH2 3 CH3 A 1, 2 and 3 B

  7. Q34(b)(ii)

    November 2020 · Paper 1

    4 marksCD Bonding and structure
    The whole paper ↗
    November 2020 Paper 1, question 34(b)(ii): Comment on the solubility of the two dyes in water. In your answer consider intermolecular bonds and their relative strengths. Solubility of dye C Solubility of

  8. Q34(d)

    November 2020 · Paper 1

    2 marksCD Bonding and structure
    The whole paper ↗
    November 2020 Paper 1, question 34(d): Wool is based on protein structures. Explain how dye D might bind to the wool fibres in weakly acidic conditions. [2]

  9. Q1(c)(i)

    June 2018 · Paper 3

    1 markCD Bonding and structure
    The whole paper ↗
    June 2018 Paper 3, question 1(c)(i): Give one property of the dye that might be affected if nitro, NO2 , groups are attached. [1]

  10. Q1(c)(ii)

    June 2018 · Paper 3

    1 markCD Bonding and structure
    The whole paper ↗
    June 2018 Paper 3, question 1(c)(ii): Give a different property affected by the attachment of sulfonate, SO3 [1]

  11. Q1(d)

    June 2018 · Paper 3

    2 marksCD Bonding and structure
    The whole paper ↗
    June 2018 Paper 3, question 1(d): Attractions between dye molecules and polymer molecules in fabric fibres can be ionic, covalent or intermolecular bonds. Use your knowledge of molecular interac

  12. Q34(c)

    June 2017 · Paper 1

    1 markCD Bonding and structure
    The whole paper ↗
    June 2017 Paper 1, question 34(c): The dye produced is not very soluble in water. In order to increase its solubility it is converted to the structure below. O O S Na+ –O OH N N – group. Name the
All 12 questions on Bonding and structure, as a list
  1. June 2025, Paper 2, Q4(e)(i) (2 marks): Acid dyes have –SO3 conditions. Explain how this occurs. [2]
  2. June 2024, Paper 1, Q35(e)(i) (1 mark): Draw a ring around the chromophore of acid orange. OH N = N SO3Na acid orange [1]
  3. June 2024, Paper 1, Q35(e)(ii) (1 mark): One part of its structure makes acid orange more soluble than many other azo dyes. Give the formula of this part. [1]
  4. June 2023, Paper 3, Q3(a)(ii) (1 mark): Indigo is used to dye cotton. The cotton structure has many –OH groups. Suggest the strongest type of intermolecular bond that binds indigo to cotton. [1]
  5. June 2022, Paper 1, Q18 (1 mark): A dye molecule is shown below. HO N N What is correct about this dye molecule? A Delocalisation extends over the whole dye molecule. B The dye molecule will att
  6. November 2021, Paper 1, Q29 (1 mark): The molecule below is an orange dye. N HO N Which group(s), when attached to a benzene ring in the dye, could change its colour? 1 OH 2 NH2 3 CH3 A 1, 2 and 3 B
  7. November 2020, Paper 1, Q34(b)(ii) (4 marks): Comment on the solubility of the two dyes in water. In your answer consider intermolecular bonds and their relative strengths. Solubility of dye C Solubility of
  8. November 2020, Paper 1, Q34(d) (2 marks): Wool is based on protein structures. Explain how dye D might bind to the wool fibres in weakly acidic conditions. [2]
  9. June 2018, Paper 3, Q1(c)(i) (1 mark): Give one property of the dye that might be affected if nitro, NO2 , groups are attached. [1]
  10. June 2018, Paper 3, Q1(c)(ii) (1 mark): Give a different property affected by the attachment of sulfonate, SO3 [1]
  11. June 2018, Paper 3, Q1(d) (2 marks): Attractions between dye molecules and polymer molecules in fabric fibres can be ionic, covalent or intermolecular bonds. Use your knowledge of molecular interac
  12. June 2017, Paper 1, Q34(c) (1 mark): The dye produced is not very soluble in water. In order to increase its solubility it is converted to the structure below. O O S Na+ –O OH N N – group. Name the

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