plumiAlkane reactivity and combustion: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.1.2.2 Alkane reactivity and combustion, 2016–2025, with mark schemes and examiner’s reports where available.
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Q16(d)
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All 9 questions on Alkane reactivity and combustion, as a list
- June 2025, Paper 2, Q16(d) (1 mark): Hexane, C6H14, is used as a fuel. 1.0 mol of hexane is mixed with 6.0 mol of oxygen and combusted. Construct an equation for the incomplete combustion of 1.0 mo
- June 2025, AS Paper 1, Q24(b) (1 mark): Pentene, C5H10, can undergo complete combustion to produce the same products as the combustion of an alkane. Write the equation for the complete combustion of C
- June 2025, AS Paper 2, Q4(b)(i) (1 mark): Write the balanced equation for the complete combustion of one mole of pentane. [1]
- June 2024, AS Paper 1, Q16 (1 mark): Which property explains the low reactivity of alkanes? A Low C–C bond enthalpy. B Low bond enthalpy of π‑bonds. C Low polarity of σ‑bonds. D Low reactivity of c
- June 2023, AS Paper 1, Q23(a)(i) (2 marks): Heptane is one of the alkanes in petrol. Write the equation for the complete combustion of heptane. State symbols are not required. [2]
- June 2022, Paper 3, Q5(b)(i) (1 mark): Write the equation for the complete combustion of this fuel. [1]
- November 2020, AS Paper 1, Q15 (1 mark): Which property explains the low reactivity of alkanes? A Electron pair repulsion between σ-bonds B Free rotation about σ-bonds C High C–C bond enthalpy D High p
- June 2018, Paper 2, Q22(a) (1 mark): Write an equation for the incomplete combustion of heptane. [1]
- June 2017, Paper 3, Q1(e) (1 mark): Suggest why some industries are interested in the presence of ‘methane hydrate’ in regions of the Earth. [1]
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