plumiPhenol and bromine water: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 18.1.4 Phenol and bromine water, 2019–2025, with mark schemes and examiner’s reports where available.
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Q20(d)(iii)
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All 15 questions on Phenol and bromine water, as a list
- June 2025, Unit 5, Q20(d)(iii) (3 marks): Explain why benzenecarboxylic acid requires concentrated nitric and sulfuric acids for nitration while salicylic acid may be nitrated using dilute nitric acid.
- June 2025 (A), Unit 5, Q13 (1 mark): The reaction between chlorine and phenol is faster than that between chlorine and benzene. Which is the best explanation for this? A the carbon‑oxygen bond is w
- January 2025, Unit 5, Q22 (6 marks): * 22 Compare and contrast the bromination of benzene and the bromination of phenol. Include equations in your answer. Detailed mechanisms are not required. (6)
- January 2025, Unit 6, Q2(a) (2 marks): A student suggested using iron as a catalyst in Step 1. Explain why it is not needed in the reaction with phenol, even though chlorination of other aryl compoun
- June 2024, Unit 5, Q15(a)(iii) (3 marks): Explain why the reaction of chlorine with phenol occurs under milder conditions than the reaction of chlorine with benzene. (3)
- January 2024, Unit 5, Q14(e) (2 marks): Another painkiller, paracetamol, can be synthesised from phenol in a similar sequence. Phenol is nitrated by dilute nitric acid. H NO2 NH2 N O HO HO HO HO pheno
- October 2023, Unit 5, Q20(a)(ii) (6 marks): Compare and contrast the reaction of benzene with bromine with the reactions of cyclohexene with bromine and of phenol with bromine. Include reasons for any dif
- June 2023, Unit 5, Q16 (1 mark): Which statement explains why bromine reacts more readily with phenol than with benzene? A the O H bond in phenol is polar B the oxygen atom in phenol is very el
- January 2023, Unit 5, Q19(a)(i) (3 marks): Draw a mechanism for the reaction to form 2-nitrophenol. + is the electrophile. Assume that NO2 (3)
- January 2023, Unit 5, Q19(a)(ii) (2 marks): Benzene requires a mixture of concentrated nitric acid and concentrated sulfuric acid at 60 °C to form nitrobenzene. Explain why phenol requires milder conditio
- October 2022, Unit 5, Q20 (6 marks): *20 Delocalised electron systems are important in determining the chemical properties of some compounds. Compare and contrast the chemical reactions of bromine
- June 2022, Unit 5, Q11 (1 mark): Which is correct for the reaction of bromine with phenol when compared with benzene? Reactivity of phenol Electron density of the ring in phenol A more reactive
- October 2021, Unit 5, Q12 (1 mark): What is the molar mass, in g mol–1, of the organic product when phenol reacts with excess bromine water? A 156.9 B 172.9 C 330.7 D 488.5
- June 2021, Unit 5, Q20(c)(i) (1 mark): Identify, by name or formula, the organic product when phenol reacts with excess bromine. (1)
- June 2021, Unit 5, Q20(c)(ii) (2 marks): Explain why bromine reacts much faster with phenol than with benzene. (2)
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