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Stereoisomerism: WJEC A‑Level Chemistry questions

Every WJEC A-Level Chemistry exam question on 4.1 Stereoisomerism, 2016–2025, with its mark scheme and examiner’s report.

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1,204 questions

  1. Q8(c)(i)

    Summer 2025 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2025 Unit 4, question 8(c)(i): State the feature present in the molecule of L-dopa that enables it to rotate the plane of plane polarised light. [1]

  2. Q8(c)(ii)

    Summer 2025 · Unit 4

    2 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2025 Unit 4, question 8(c)(ii): L-dopa rotates the plane of plane polarised light to the left (–) whereas D-dopa rotates it to the right (+). At a certain concentration pure forms of the acid

  3. Q10(a)

    Summer 2024 · Unit 4

    6 marks4.1 Stereoisomerism1.3 Chemical calculations
    The whole paper ↗
    Summer 2024 Unit 4, question 10(a): Compound B contains only carbon, hydrogen and bromine. The hydrogen and bromine atoms could be at any of the positions indicated by a circle in the following st

  4. Q11(c)

    Summer 2024 · Unit 4

    3 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2024 Unit 4, question 11(c): A solution contains a mass of z g of one of the two enantiomers of alanine. It rotates the plane of plane polarised light in the clockwise direction (+) by 6° (

  5. Q8(b)(i)

    Summer 2023 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2023 Unit 4, question 8(b)(i): Indicate any chiral centre(s) present by means of an asterisk (*). [1]

  6. Q8(b)(ii)

    Summer 2023 · Unit 4

    2 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2023 Unit 4, question 8(b)(ii): This acid occurs in a number of optically active forms. Complete the sentences below. Forms of tartaric acid that rotate the plane of plane-polarised light are

  7. Q8(c)

    Summer 2023 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2023 Unit 4, question 8(c): Both sorbic acid and tartaric acid are described as showing stereoisomerism. Explain what is meant by the term stereoisomerism. [1]

  8. Q6(b)

    Summer 2022 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2022 Unit 4, question 6(b): Draw the structures of the two enantiomers of 2-hydroxypropanenitrile. [1]

  9. Q12(a)(iii)

    Summer 2022 · Unit 4

    6 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2022 Unit 4, question 12(a)(iii): Compound A displays both forms of stereoisomerism. I. State how structural isomerism differs from stereoisomerism. [2] II. Indicate the position of a chiral cen

  10. Q7(b)

    Summer 2019 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2019 Unit 4, question 7(b): Draw the displayed formula of a stereoisomer of 1,2-dichlorocyclopropane. [1]

  11. Q8(b)

    Summer 2019 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2019 Unit 4, question 8(b): Explain why an aqueous solution of aminoethanoic acid does not affect the plane of plane polarised light. [1]

  12. Q8(d)(i)

    Summer 2018 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2018 Unit 4, question 8(d)(i): Explain why 1,3,3,3-tetrafluoropropene exists as E/Z isomers. [1]

  13. Q8(d)(iii)

    Summer 2018 · Unit 4

    2 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2018 Unit 4, question 8(d)(iii): Both the compounds formed in part (ii) will rotate the plane of plane polarised light. Give the formula of both compounds indicating the chiral centre in both.

  14. Q8(d)(iv)

    Summer 2018 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2018 Unit 4, question 8(d)(iv): Draw the two mirror image forms of the compound 1-bromo-1,2-difluoroethane, CHBrFCH2F. [1]

  15. Q12(b)(i)

    Summer 2017 · Unit 4

    1 mark4.1 Stereoisomerism
    The whole paper ↗
    Summer 2017 Unit 4, question 12(b)(i): Identify the chiral centre on the formula of L-DOPA by using an asterisk (*). [1]

  16. Q12(b)(ii)

    Summer 2017 · Unit 4

    2 marks4.1 Stereoisomerism
    The whole paper ↗
    Summer 2017 Unit 4, question 12(b)(ii): A solution containing equimolar proportions of L-DOPA and its enantiomer D-DOPA is described as a racemic mixture. Explain why this mixture has no apparent effe
All 16 questions on Stereoisomerism, as a list
  1. Summer 2025, Unit 4, Q8(c)(i) (1 mark): State the feature present in the molecule of L-dopa that enables it to rotate the plane of plane polarised light. [1]
  2. Summer 2025, Unit 4, Q8(c)(ii) (2 marks): L-dopa rotates the plane of plane polarised light to the left (–) whereas D-dopa rotates it to the right (+). At a certain concentration pure forms of the acid
  3. Summer 2024, Unit 4, Q10(a) (6 marks): Compound B contains only carbon, hydrogen and bromine. The hydrogen and bromine atoms could be at any of the positions indicated by a circle in the following st
  4. Summer 2024, Unit 4, Q11(c) (3 marks): A solution contains a mass of z g of one of the two enantiomers of alanine. It rotates the plane of plane polarised light in the clockwise direction (+) by 6° (
  5. Summer 2023, Unit 4, Q8(b)(i) (1 mark): Indicate any chiral centre(s) present by means of an asterisk (*). [1]
  6. Summer 2023, Unit 4, Q8(b)(ii) (2 marks): This acid occurs in a number of optically active forms. Complete the sentences below. Forms of tartaric acid that rotate the plane of plane-polarised light are
  7. Summer 2023, Unit 4, Q8(c) (1 mark): Both sorbic acid and tartaric acid are described as showing stereoisomerism. Explain what is meant by the term stereoisomerism. [1]
  8. Summer 2022, Unit 4, Q6(b) (1 mark): Draw the structures of the two enantiomers of 2-hydroxypropanenitrile. [1]
  9. Summer 2022, Unit 4, Q12(a)(iii) (6 marks): Compound A displays both forms of stereoisomerism. I. State how structural isomerism differs from stereoisomerism. [2] II. Indicate the position of a chiral cen
  10. Summer 2019, Unit 4, Q7(b) (1 mark): Draw the displayed formula of a stereoisomer of 1,2-dichlorocyclopropane. [1]
  11. Summer 2019, Unit 4, Q8(b) (1 mark): Explain why an aqueous solution of aminoethanoic acid does not affect the plane of plane polarised light. [1]
  12. Summer 2018, Unit 4, Q8(d)(i) (1 mark): Explain why 1,3,3,3-tetrafluoropropene exists as E/Z isomers. [1]
  13. Summer 2018, Unit 4, Q8(d)(iii) (2 marks): Both the compounds formed in part (ii) will rotate the plane of plane polarised light. Give the formula of both compounds indicating the chiral centre in both.
  14. Summer 2018, Unit 4, Q8(d)(iv) (1 mark): Draw the two mirror image forms of the compound 1-bromo-1,2-difluoroethane, CHBrFCH2F. [1]
  15. Summer 2017, Unit 4, Q12(b)(i) (1 mark): Identify the chiral centre on the formula of L-DOPA by using an asterisk (*). [1]
  16. Summer 2017, Unit 4, Q12(b)(ii) (2 marks): A solution containing equimolar proportions of L-DOPA and its enantiomer D-DOPA is described as a racemic mixture. Explain why this mixture has no apparent effe

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