plumiAlkanes, cycloalkanes and structural isomers: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 4.B.1 Alkanes, cycloalkanes and structural isomers, 2019–2025, with mark schemes and examiner’s reports where available.
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All 27 questions on Alkanes, cycloalkanes and structural isomers, as a list
- June 2025, AS Unit 1, Q17 (1 mark): Which structures represent a pair of isomers? A B C D
- June 2025, AS Unit 1, Q20(b)(iv) (2 marks): The formula C12H26 represents many isomers, including six diethyloctanes. The names of four of these diethyloctanes are 3,3-diethyloctane, 3,4-diethyloctane, 3,
- January 2025, AS Unit 1, Q24(c) (2 marks): Identify, by name or formula, two possible structural isomers of X using your answers to (a)(iv) and (b). (2)
- June 2024, AS Unit 1, Q4 (1 mark): What is the best definition of a hydrocarbon? A a compound containing carbon, hydrogen and oxygen B a compound containing carbon and hydrogen only C a compound
- January 2024, AS Unit 1, Q14 (1 mark): How many structural isomers have the formula C6H14? A 3 B 4 C 5 D 6 Use this space for any rough working. Anything you write in this space will gain no credit.
- January 2024, AS Unit 1, Q22(b) (1 mark): The unknown gas is a hydrocarbon. Give the name or formula for the unknown gas using your answer to (a). (1)
- October 2023, AS Unit 1, Q15 (1 mark): What is the number of structural isomers with the molecular formula C5H12? A six B five C four D three
- January 2023, AS Unit 1, Q21(a)(i) (2 marks): Give the molecular formula and IUPAC name for X. (2)
- October 2022, AS Unit 1, Q15(a)(i) (1 mark): Give the IUPAC name for iso‑octane. (1)
- October 2022, AS Unit 2, Q6 (1 mark): How many structural isomers with the molecular formula C5H10O react with Benedict’s or Fehling’s solutions? A 2 B 3 C 4 D 5
- June 2022, AS Unit 1, Q15 (1 mark): A hydrocarbon X has a molar mass of 98 g mol−1 . When a sample of X is shaken with bromine water, the colour of the bromine water does not change. Which of thes
- January 2022, AS Unit 1, Q11 (1 mark): All alkanes have the same A empirical formula B general formula C molecular formula D structural formula
- January 2022, AS Unit 1, Q13 (1 mark): How many structural isomers have the formula C3H6Cl2? A 2 B 3 C 4 D 5
- January 2022, AS Unit 1, Q24(b) (1 mark): The organic liquid C is a hydrocarbon. Give a possible name or formula for C, using your answer in (a). (1)
- October 2021, AS Unit 1, Q15(b)(ii) (2 marks): One of the products of this cracking reaction is but-1-ene. Give the skeletal formulae for the other three alkene isomers of C4H8 (2)
- October 2021, Unit 6, Q4(f)(ii) (2 marks): Use your answer to (f)(i) to draw the structures of the four possible alcohols, ROH. (2)
- June 2021, AS Unit 1, Q21(b)(i) (2 marks): Draw the skeletal formulae of a branched-chain alkane and a cycloalkane, each containing seven carbon atoms. (2) Branched-chain alkane Cycloalkane
- June 2021, AS Unit 1, Q23(b)(i) (1 mark): Draw the structure of the branched-chain alkene with the molecular formula C4H8 . (1)
- January 2021, AS Unit 1, Q21(a) (2 marks): Suggest two properties that make squalane useful in cosmetics. (2)
- January 2021, AS Unit 1, Q21(b) (1 mark): Give the molecular formula of squalane. (1)
- January 2021, AS Unit 1, Q21(f)(i) (2 marks): State what is meant by the term structural isomers. (2)
- January 2021, AS Unit 1, Q21(f)(iii) (1 mark): Complete the diagram to show another structural isomer of C15H24 . (1)
- January 2021, Unit 5, Q22(b) (2 marks): When CxHy was added to a little bromine water and the mixture shaken, the bromine water remained yellow. Suggest two possible structures for CxHy . (2)
- October 2020, Unit 5, Q5 (1 mark): How many isomers containing a benzene ring are there with the molecular formula C6H3(NO2)2OH? A 4 B 5 C 6 D 7
- January 2020, AS Unit 1, Q20(a) (4 marks): The skeletal formula of hexane is Draw the four structural isomers of hexane in the boxes. (4) Isomer 1 Isomer 2 Isomer 3 Isomer 4
- January 2019, AS Unit 1, Q14 (1 mark): What is the total number of structural isomers with the molecular formula C6H14? A 4 B 5 C 6 D 7
- January 2019, AS Unit 1, Q21(a)(ii) (1 mark): Draw the skeletal formula of 2,2,3-trimethylbutane. (1)
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