plumiProperties and combustion of alcohols: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.2.1.1 Properties and combustion of alcohols, 2016–2025, with mark schemes and examiner’s reports where available.
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Q25(a)
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All 11 questions on Properties and combustion of alcohols, as a list
- June 2024, AS Paper 1, Q25(a) (2 marks): A, B and C take part in combustion reactions. Complete the equation for the complete combustion of C5H12O. C5H12O + [2]
- June 2023, Paper 2, Q17(a) (2 marks): An unsaturated alcohol has 6 carbon atoms and contains one C=C bond. Construct an equation for the complete combustion of this alcohol. [2]
- June 2022, Paper 3, Q6(b)(i) (1 mark): Suggest why vitamin C is extremely soluble in water. [1]
- November 2021, Paper 2, Q4 (1 mark): What is the correct equation for the incomplete combustion of butan-1-ol? A CH3CH2CH2CH2OH + 1½O2 4CO + 5H2 B CH3CH2CH2CH2OH + 2O2 4CO + 5H2 C CH3CH2CH2CH2OH +
- November 2020, AS Paper 2, Q5(b) (1 mark): Complete a balanced equation for the complete combustion of alcohol C. [1] CH3CH2CH(OH)CH3 + +
- June 2019, AS Paper 1, Q25(a)(iii) (1 mark): Complete the equation below for the complete combustion of alcohol A. C4H10O → [1]
- June 2018, Paper 2, Q22(b) (4 marks): Explain the difference in the boiling points of the fuels in Table 22.1. [4]
- June 2017, Paper 2, Q19(a) (1 mark): Construct an equation for the complete combustion of an unsaturated alcohol with 5 carbon atoms. [1]
- June 2017, Paper 2, Q19(b)(i) (2 marks): Explain, with the aid of a diagram, why ethanol is soluble in water. Include relevant dipoles and lone pairs. [2]
- June 2017, Paper 2, Q19(b)(ii) (1 mark): The solubility of hexan-1-ol and hexane-1,6-diol in water is shown below in Table 19.1. Solubility in water / g dm−3 Alcohol hexan-1-ol 5.9 hexane-1,6-diol 500
- June 2017, AS Paper 2, Q4(a) (2 marks): Methanol, CH3OH, is soluble in water because it has polar bonds. Pauling electronegativity values for carbon, oxygen and hydrogen are shown below. Element Elect
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