plumiBonding, shape and boiling points of alkanes: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.1.2.1 Bonding, shape and boiling points of alkanes, 2016–2025, with mark schemes and examiner’s reports where available.
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Q4(a)
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All 10 questions on Bonding, shape and boiling points of alkanes, as a list
- June 2025, AS Paper 2, Q4(a) (4 marks): State and explain the trend in boiling points of the straight chain alkanes in Table 4.1. [4]
- June 2024, AS Paper 1, Q24(a) (4 marks): The skeletal formulae and boiling points of three isomers of C6H14 are shown in the table below. Molecular Boiling point / Isomer Skeletal formula formula °C A
- June 2023, Paper 2, Q16(a) (4 marks): The boiling points of some hydrocarbons containing 6 carbon atoms are shown below. Hydrocarbon Boiling point / ºC 2,2-dimethylbutane 50 2-methylpentane 60 hexan
- June 2023, AS Paper 1, Q25(a) (2 marks): The boiling points of 2 hydrocarbons are shown below. Hydrocarbon Boiling point / °C butane 0 pentane 36 Explain the difference in the boiling points of butane
- November 2021, AS Paper 1, Q15 (1 mark): Which structural isomer of C7H16 has the weakest induced dipole–dipole interactions (London forces)? A 2,3-dimethylpentane B 3-ethylpentane C 2-methylhexane D 2
- June 2019, Paper 2, Q1 (1 mark): Which alkane has the highest boiling point? A CH3(CH2)5CH3 B (CH3)3CCH(CH3)2 C CH3(CH2)3CH(CH3)2 D (CH3)2CHCH2CH(CH3)2 Your answer [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 2018, AS Paper 1, Q24(a) (5 marks): Compounds A, B and C are saturated hydrocarbons. The structures and boiling points of A, B and C are shown below. Isomer Boiling point / °C A 36 B 28 C 9 • Use
- June 2017, Paper 2, Q16(a) (2 marks): Compound A and compound B are isomers. compound A compound B Compound A has a lower melting point than compound B. Suggest why. [2]
- June 2017, AS Paper 1, Q17 (1 mark): Which organic compound has the lowest boiling point? A 2,3,4-trimethylpentane B 2,3-dimethylhexane C 2-methylheptane D octane Your answer [1]
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