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Organic reactions: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on OZ Organic reactions (specification points OZ(k)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q15

    June 2024 · Paper 1

    1 markOZ Organic reactions
    The whole paper ↗
    June 2024 Paper 1, question 15: Which of 1-iodobutane and 1-chlorobutane has the higher boiling point and why? A 1-Chlorobutane because its molecules have the stronger permanent dipole–dipole

  2. Q1(a)(i)

    June 2022 · Paper 3

    3 marksOZ Organic reactions
    The whole paper ↗
    June 2022 Paper 3, question 1(a)(i): Complete the flowchart showing the structures of compounds A and C. On the dotted line show the reagent needed to form compound B. [3]

  3. Q7

    June 2022 · AS Paper 1

    1 markOZ Organic reactions
    The whole paper ↗
    June 2022 AS Paper 1, question 7: Which statement correctly describes the reaction below? C4H9Cl + NH3 C4H9NH2 + HCl A Ammonia adds to a haloalkane to form an amine. B Ammonia is displacing hydr

  4. Q24

    November 2021 · Paper 1

    1 markOZ Organic reactions
    The whole paper ↗
    November 2021 Paper 1, question 24: What is the reason that 1-chlorobutane has a lower boiling point than 1-iodobutane? A 1-chlorobutane is less reactive. B The hydrogen bonds are weaker in 1-chlo

  5. Q32(b)(i)

    November 2021 · Paper 1

    1 markOZ Organic reactions
    The whole paper ↗
    November 2021 Paper 1, question 32(b)(i): Chloroethane, C2H5Cl, reacts with concentrated ammonia. Give the equation for the reaction. [1]

  6. Q32(c)(ii)

    November 2021 · Paper 1

    2 marksOZ Organic reactions
    The whole paper ↗
    November 2021 Paper 1, question 32(c)(ii): Write equations for the formation of the precipitate from iodoethane, C2H5I. [2]

  7. Q3(e)(i)

    November 2021 · AS Paper 2

    1 markOZ Organic reactions
    The whole paper ↗
    November 2021 AS Paper 2, question 3(e)(i): Write the equation for the hydrolysis of chloromethane, CH3Cl, by water. [1]

  8. Q6

    June 2019 · AS Paper 1

    1 markOZ Organic reactions
    The whole paper ↗
    June 2019 AS Paper 1, question 6: Which statement about the reaction RCl + NH3 RNH2 + HCl is correct? A An amine is formed. B RCl is acting as an acid. C The reaction is electrophilic substituti
All 8 questions on Organic reactions, as a list
  1. June 2024, Paper 1, Q15 (1 mark): Which of 1-iodobutane and 1-chlorobutane has the higher boiling point and why? A 1-Chlorobutane because its molecules have the stronger permanent dipole–dipole
  2. June 2022, Paper 3, Q1(a)(i) (3 marks): Complete the flowchart showing the structures of compounds A and C. On the dotted line show the reagent needed to form compound B. [3]
  3. June 2022, AS Paper 1, Q7 (1 mark): Which statement correctly describes the reaction below? C4H9Cl + NH3 C4H9NH2 + HCl A Ammonia adds to a haloalkane to form an amine. B Ammonia is displacing hydr
  4. November 2021, Paper 1, Q24 (1 mark): What is the reason that 1-chlorobutane has a lower boiling point than 1-iodobutane? A 1-chlorobutane is less reactive. B The hydrogen bonds are weaker in 1-chlo
  5. November 2021, Paper 1, Q32(b)(i) (1 mark): Chloroethane, C2H5Cl, reacts with concentrated ammonia. Give the equation for the reaction. [1]
  6. November 2021, Paper 1, Q32(c)(ii) (2 marks): Write equations for the formation of the precipitate from iodoethane, C2H5I. [2]
  7. November 2021, AS Paper 2, Q3(e)(i) (1 mark): Write the equation for the hydrolysis of chloromethane, CH3Cl, by water. [1]
  8. June 2019, AS Paper 1, Q6 (1 mark): Which statement about the reaction RCl + NH3 RNH2 + HCl is correct? A An amine is formed. B RCl is acting as an acid. C The reaction is electrophilic substituti

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