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Friedel–Crafts alkylation and acylation: OCR A‑Level Chemistry A questions

OCR A-Level Chemistry A past-paper questions on 6.2.4.2 Friedel–Crafts alkylation and acylation, 2016–2025, with mark schemes and examiner’s reports where available.

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  1. Q20(c)(i)

    June 2025 · Paper 2

    1 mark6.1.1.2 Electrophilic substitution of arenes6.2.4.2 Friedel–Crafts alkylation and acylation
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    The start of question 20

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  2. Q21(a)(ii)

    June 2024 · Paper 2

    5 marks6.1.1.2 Electrophilic substitution of arenes6.2.4.2 Friedel–Crafts alkylation and acylation
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    The start of question 21

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  3. Q15

    November 2020 · Paper 2

    1 mark6.2.4.2 Friedel–Crafts alkylation and acylation6.1.1.2 Electrophilic substitution of arenes
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  4. Q19(b)(iii)

    June 2019 · Paper 2

    5 marks6.2.4.2 Friedel–Crafts alkylation and acylation6.1.1.2 Electrophilic substitution of arenes
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    The start of question 19

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  5. Q10

    June 2018 · Paper 2

    1 mark6.2.4.2 Friedel–Crafts alkylation and acylation
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  6. Q15

    June 2018 · Paper 2

    1 mark6.2.4.2 Friedel–Crafts alkylation and acylation6.2.4.1 Nitriles and extending carbon chains
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All 6 questions on Friedel–Crafts alkylation and acylation, as a list
  1. June 2025, Paper 2, Q20(c)(i) (1 mark): Suggest a reagent and halogen carrier that could be used in Stage 1 of Synthesis 1. [1]
  2. June 2024, Paper 2, Q21(a)(ii) (5 marks): Outline the mechanism for this reaction, including the role of Al Cl 3 as a halogen carrier. [5]
  3. November 2020, Paper 2, Q15 (1 mark): Which compound(s) could be prepared by reacting benzene with an acyl chloride in the presence of a halogen carrier? CH2COCH3 1 CHO 2 COCH3 3 A 1, 2 and 3 B Only
  4. June 2019, Paper 2, Q19(b)(iii) (5 marks): In the synthesis of compounds D and E, benzene is first reacted with ethanoyl chloride, CH3COCl, to form phenylethanone, shown below. O H3C C phenylethanone The
  5. June 2018, Paper 2, Q10 (1 mark): Benzene reacts with an organic reagent in the presence of a halogen carrier to form phenylethanone. O C CH3 phenylethanone Which organic reagent is required? A
  6. June 2018, Paper 2, Q15 (1 mark): Which of the following could react with the compound below to form a carbon–carbon bond? H O C C OH Br 1 CH3Cl and Al Cl3 2 KCN in ethanol 3 CH3OH and H2SO4 A 1

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