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Isomerism: OCR A‑Level Chemistry B questions

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

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2,049 questions

  1. Q8

    June 2024 · Paper 1

    1 markPL Isomerism
    The whole paper ↗
    June 2024 Paper 1, question 8: Which compound has optical isomers? A CH3CH2COOH B CH3CH2CONH2 C H2NCH2COOH D H2NCH(CH3)COOH Your answer [1]

  2. Q35(b)(i)

    June 2023 · Paper 1

    1 markPL Isomerism
    The whole paper ↗
    June 2023 Paper 1, question 35(b)(i): Describe the feature of the amino acid structure that allows optical isomerism to occur. [1]

  3. Q35(b)(ii)

    June 2023 · Paper 1

    2 marksPL Isomerism
    The whole paper ↗
    June 2023 Paper 1, question 35(b)(ii): Draw two diagrams that show the 3-D relationship between the optical isomers of alanine, H2NCH(CH3)COOH. mirror [2]

  4. Q4(a)(i)

    June 2022 · Paper 2

    3 marksPL Isomerism
    The whole paper ↗
    June 2022 Paper 2, question 4(a)(i): A molecule of serine has a chiral centre and two enantiomers. Draw and label two serine molecules below to illustrate the meaning of the terms chiral centre and

  5. Q2(c)(ii)

    November 2021 · Paper 3

    3 marksPL Isomerism
    The whole paper ↗
    November 2021 Paper 3, question 2(c)(ii): Salbutamol and salmeterol are both chiral molecules and have enantiomers. The structure of salbutamol can be represented as shown below. R1CH(OH)R2 Use this rep

  6. Q1(b)(i)

    November 2020 · Paper 2

    2 marksPL Isomerism
    The whole paper ↗
    November 2020 Paper 2, question 1(b)(i): Phenylalanine has a chiral centre. Draw the three dimensional formulae to show the enantiomers of phenylalanine. mirror [2]

  7. Q1(a)

    June 2019 · Paper 3

    3 marksPL Isomerism
    The whole paper ↗
    June 2019 Paper 3, question 1(a): Lactic acid is a chiral molecule. Explain the term chiral in this context and use 3-D structures to help your explanation. Explanation Structures [3]

  8. Q32(c)(i)

    June 2018 · Paper 1

    1 markPL Isomerism
    The whole paper ↗
    June 2018 Paper 1, question 32(c)(i): Circle all the chiral centres in the section of protein shown below. [1] O O O O O NH CH C NH CH2 C NH CH2 C NH CH C NH CH C CH2 CH2 CH2 CH CH3 CH3 OH

  9. Q3(a)(i)

    June 2017 · Paper 2

    1 markPL Isomerism
    The whole paper ↗
    June 2017 Paper 2, question 3(a)(i): Circle all the chiral centres on both structures above. [1]
All 9 questions on Isomerism, as a list
  1. June 2024, Paper 1, Q8 (1 mark): Which compound has optical isomers? A CH3CH2COOH B CH3CH2CONH2 C H2NCH2COOH D H2NCH(CH3)COOH Your answer [1]
  2. June 2023, Paper 1, Q35(b)(i) (1 mark): Describe the feature of the amino acid structure that allows optical isomerism to occur. [1]
  3. June 2023, Paper 1, Q35(b)(ii) (2 marks): Draw two diagrams that show the 3-D relationship between the optical isomers of alanine, H2NCH(CH3)COOH. mirror [2]
  4. June 2022, Paper 2, Q4(a)(i) (3 marks): A molecule of serine has a chiral centre and two enantiomers. Draw and label two serine molecules below to illustrate the meaning of the terms chiral centre and
  5. November 2021, Paper 3, Q2(c)(ii) (3 marks): Salbutamol and salmeterol are both chiral molecules and have enantiomers. The structure of salbutamol can be represented as shown below. R1CH(OH)R2 Use this rep
  6. November 2020, Paper 2, Q1(b)(i) (2 marks): Phenylalanine has a chiral centre. Draw the three dimensional formulae to show the enantiomers of phenylalanine. mirror [2]
  7. June 2019, Paper 3, Q1(a) (3 marks): Lactic acid is a chiral molecule. Explain the term chiral in this context and use 3-D structures to help your explanation. Explanation Structures [3]
  8. June 2018, Paper 1, Q32(c)(i) (1 mark): Circle all the chiral centres in the section of protein shown below. [1] O O O O O NH CH C NH CH2 C NH CH2 C NH CH C NH CH C CH2 CH2 CH2 CH CH3 CH3 OH
  9. June 2017, Paper 2, Q3(a)(i) (1 mark): Circle all the chiral centres on both structures above. [1]

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