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Stereoisomerism: Eduqas A‑Level Chemistry questions

Every Eduqas A-Level Chemistry exam question on OA1.1 Stereoisomerism, 2016–2025, with its mark scheme and examiner’s report.

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1,513 questions

  1. Q10(b)(ii)

    June 2025 · Component 2

    2 marksOA1.1 Stereoisomerism
    The whole paper ↗
    June 2025 Component 2, question 10(b)(ii): I. Indicate the position of the chiral centre in 3-bromohexane by using an asterisk (*) on the structure below. [1] CH3 CH2 CH2 CHBr CH2 CH3 II. Suggest why a

  2. Q11(e)(i)

    June 2025 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2025 Component 2, question 11(e)(i): Suggest the structure of a monochlorinated propanoic acid that does not contain a chiral centre. [1]

  3. Q7(e)(i)

    June 2024 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2024 Component 2, question 7(e)(i): Use an asterisk (*) to indicate the position of a chiral centre in the structure of malic acid. [1] H OH O O C C C C HO OH H H

  4. Q7(e)(ii)

    June 2024 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2024 Component 2, question 7(e)(ii): Malic acid is one of the acidic compounds found in apples. Only one of the two enantiomers is present. When malic acid is produced synthetically equal quantitie

  5. Q6(d)(iii)

    Autumn 2021 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2021 Component 2, question 6(d)(iii): Cysteine contains a chiral centre and exists in two mirror image forms. Draw the 3D structures of these two forms. [1]

  6. Q10(b)(i)

    Autumn 2020 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 2, question 10(b)(i): Naturally-occurring malic acid is one of two enantiomers. One is drawn below. Draw the structure of the other enantiomer. [1] COOH C C H HOOC CH2 OH

  7. Q10(b)(ii)

    Autumn 2020 · Component 2

    3 marksOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 2, question 10(b)(ii): The two enantiomers of malic acid rotate the plane of plane polarised light. The extent to which this occurs can be calculated from the formula D = 100 20 c L w

  8. Q10(c)(i)

    Autumn 2020 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 2, question 10(c)(i): Explain the term stereoisomerism. [1]

  9. Q10(c)(ii)

    Autumn 2020 · Component 2

    2 marksOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 2, question 10(c)(ii): All three acids show stereoisomerism. Explain how the type of stereoisomerism shown by malic acid differs from that shown by maleic acid and fumaric acid. You s

  10. Q1(b)(i)

    Autumn 2020 · Component 3

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 3, question 1(b)(i): Draw diagrams to represent both optical isomers. [1]

  11. Q1(b)(ii)

    Autumn 2020 · Component 3

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    Autumn 2020 Component 3, question 1(b)(ii): Give one difference between the properties of the two optical isomers. [1]

  12. Q10(b)(iii)

    June 2019 · Component 2

    1 markOA3.2 Amino acids, peptides and proteinsOA1.1 Stereoisomerism
    The whole paper ↗
    June 2019 Component 2, question 10(b)(iii): Cysteine is an α-amino acid that contains a chiral centre. Write the displayed formula of an α-amino acid that does not contain a chiral centre. [1]

  13. Q13(b)(iv)

    June 2019 · Component 2

    2 marksOA2.2 Aldehydes and ketonesOA1.1 Stereoisomerism
    The whole paper ↗
    June 2019 Component 2, question 13(b)(iv): The reaction of 2-methylhept-2-en-6-one with aqueous sodium tetrahydridoborate(III) results in the formation of a new compound which has forms that rotate the p

  14. Q13(c)(i)

    June 2018 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2018 Component 2, question 13(c)(i): State which of the three compounds could be identified by its ability to rotate the plane of plane polarised light. Give a reason for your answer. [1]

  15. Q13(a)(i)

    June 2017 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2017 Component 2, question 13(a)(i): State what is meant by a chiral centre. [1]

  16. Q13(a)(ii)

    June 2017 · Component 2

    1 markOA1.1 Stereoisomerism
    The whole paper ↗
    June 2017 Component 2, question 13(a)(ii): Draw the two mirror image forms of 2,3-dihydroxypropanal. [1]

  17. Q13(c)

    June 2017 · Component 2

    2 marksOA1.1 Stereoisomerism
    The whole paper ↗
    June 2017 Component 2, question 13(c): Glucose occurs as two enantiomers. The concentration of an enantiomer can be found by using a polarimeter to measure the rotation of the plane of plane polarise
All 17 questions on Stereoisomerism, as a list
  1. June 2025, Component 2, Q10(b)(ii) (2 marks): I. Indicate the position of the chiral centre in 3-bromohexane by using an asterisk (*) on the structure below. [1] CH3 CH2 CH2 CHBr CH2 CH3 II. Suggest why a
  2. June 2025, Component 2, Q11(e)(i) (1 mark): Suggest the structure of a monochlorinated propanoic acid that does not contain a chiral centre. [1]
  3. June 2024, Component 2, Q7(e)(i) (1 mark): Use an asterisk (*) to indicate the position of a chiral centre in the structure of malic acid. [1] H OH O O C C C C HO OH H H
  4. June 2024, Component 2, Q7(e)(ii) (1 mark): Malic acid is one of the acidic compounds found in apples. Only one of the two enantiomers is present. When malic acid is produced synthetically equal quantitie
  5. Autumn 2021, Component 2, Q6(d)(iii) (1 mark): Cysteine contains a chiral centre and exists in two mirror image forms. Draw the 3D structures of these two forms. [1]
  6. Autumn 2020, Component 2, Q10(b)(i) (1 mark): Naturally-occurring malic acid is one of two enantiomers. One is drawn below. Draw the structure of the other enantiomer. [1] COOH C C H HOOC CH2 OH
  7. Autumn 2020, Component 2, Q10(b)(ii) (3 marks): The two enantiomers of malic acid rotate the plane of plane polarised light. The extent to which this occurs can be calculated from the formula D = 100 20 c L w
  8. Autumn 2020, Component 2, Q10(c)(i) (1 mark): Explain the term stereoisomerism. [1]
  9. Autumn 2020, Component 2, Q10(c)(ii) (2 marks): All three acids show stereoisomerism. Explain how the type of stereoisomerism shown by malic acid differs from that shown by maleic acid and fumaric acid. You s
  10. Autumn 2020, Component 3, Q1(b)(i) (1 mark): Draw diagrams to represent both optical isomers. [1]
  11. Autumn 2020, Component 3, Q1(b)(ii) (1 mark): Give one difference between the properties of the two optical isomers. [1]
  12. June 2019, Component 2, Q10(b)(iii) (1 mark): Cysteine is an α-amino acid that contains a chiral centre. Write the displayed formula of an α-amino acid that does not contain a chiral centre. [1]
  13. June 2019, Component 2, Q13(b)(iv) (2 marks): The reaction of 2-methylhept-2-en-6-one with aqueous sodium tetrahydridoborate(III) results in the formation of a new compound which has forms that rotate the p
  14. June 2018, Component 2, Q13(c)(i) (1 mark): State which of the three compounds could be identified by its ability to rotate the plane of plane polarised light. Give a reason for your answer. [1]
  15. June 2017, Component 2, Q13(a)(i) (1 mark): State what is meant by a chiral centre. [1]
  16. June 2017, Component 2, Q13(a)(ii) (1 mark): Draw the two mirror image forms of 2,3-dihydroxypropanal. [1]
  17. June 2017, Component 2, Q13(c) (2 marks): Glucose occurs as two enantiomers. The concentration of an enantiomer can be found by using a polarimeter to measure the rotation of the plane of plane polarise

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