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Question bank›OCR A‑Level Chemistry A›4.1.1.3 Structural isomers and their formulae

Structural isomers and their formulae: OCR A‑Level Chemistry A questions

OCR A-Level Chemistry A past-paper questions on 4.1.1.3 Structural isomers and their formulae, 2016–2025, with mark schemes and examiner’s reports where available.

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Paper 1 · Periodic Table, Elements and Physical ChemistryPaper 2 · Synthesis and Analytical TechniquesPaper 3 · Unified ChemistryAS Paper 1 · Breadth in ChemistryAS Paper 2 · Depth in Chemistry

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June 2025June 2024June 2023June 2022November 2021November 2020June 2019June 2018June 2017June 2016

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Q14
June 2025 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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Q17
June 2025 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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Q4(c)
June 2025 · AS Paper 2
2 marks4.1.1.3 Structural isomers and their formulae 4.1.1.1 Naming and representing organic compounds
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Q16
June 2023 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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Q16(b)(i)
June 2022 · Paper 2
1 mark4.1.1.3 Structural isomers and their formulae
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Q13
November 2021 · AS Paper 1
1 mark4.1.3.2 E/Z and cis–trans isomerism 4.1.1.3 Structural isomers and their formulae
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Q24(b)(i)
November 2021 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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Q7(c)(i)
November 2021 · AS Paper 2
1 mark4.1.1.1 Naming and representing organic compounds 4.1.1.3 Structural isomers and their formulae
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Q10
November 2020 · Paper 2
1 mark4.1.1.3 Structural isomers and their formulae
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Q14
November 2020 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae 4.1.1.1 Naming and representing organic compounds
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Q25(c)(iv)
November 2020 · AS Paper 1
2 marks4.1.1.3 Structural isomers and their formulae
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Q16(b)(iii)
June 2019 · Paper 2
1 mark4.1.1.3 Structural isomers and their formulae
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Q11
June 2018 · Paper 2
1 mark6.2.2.2 Optical isomerism and chiral centres 4.1.1.3 Structural isomers and their formulae
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Q16
June 2018 · AS Paper 1
1 mark4.2.1.2 Oxidation of alcohols 4.1.1.3 Structural isomers and their formulae
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Q24(a)
June 2018 · AS Paper 1
5 marks4.1.1.3 Structural isomers and their formulae 4.1.2.1 Bonding, shape and boiling points of alkanes
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Q24(b)(ii)
June 2018 · AS Paper 1
2 marks4.1.2.3 Radical substitution with halogens 4.1.1.3 Structural isomers and their formulae
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Q15
June 2017 · Paper 2
1 mark4.1.1.3 Structural isomers and their formulae
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Q16
June 2017 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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Q5(c)
June 2017 · AS Paper 2
4 marks4.2.4.2 Infrared spectra and their uses 4.1.1.3 Structural isomers and their formulae
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Q13
June 2016 · AS Paper 1
1 mark4.1.1.3 Structural isomers and their formulae
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All 20 questions on Structural isomers and their formulae, as a list

June 2025, AS Paper 1, Q14 (1 mark): The skeletal formulae of four alcohols, W, X, Y, Z, are shown below. OH W OH X OH Y OH Z Which pair of alcohols are structural isomers of each other? A W and X
June 2025, AS Paper 1, Q17 (1 mark): How many structural isomers of C5H12O are secondary alcohols? A 1 B 2 C 3 D 4 Your answer [1]
June 2025, AS Paper 2, Q4(c) (2 marks): Besides pentane, there are two other structural isomers of C5H12. Draw the skeletal formulae of these two other structural isomers and state the systematic name
June 2023, AS Paper 1, Q16 (1 mark): How many structural isomers have the molecular formula C4H9Cl ? A 2 B 3 C 4 D 5 Your answer [1]
June 2022, Paper 2, Q16(b)(i) (1 mark): What is meant by the term structural isomers? [1]
November 2021, AS Paper 1, Q13 (1 mark): What is the number of unsaturated isomers (structural and stereoisomers) that have the molecular formula C4H8? A 3 B 4 C 5 D 6 Your answer [1]
November 2021, AS Paper 1, Q24(b)(i) (1 mark): Explain the term structural isomer. [1]
November 2021, AS Paper 2, Q7(c)(i) (1 mark): Compound A is a secondary alcohol. What is the systematic name of compound A? [1]
November 2020, Paper 2, Q10 (1 mark): What is the number of alicyclic structural isomers of C5H10? A 3 B 4 C 5 D 6 Your answer [1]
November 2020, AS Paper 1, Q14 (1 mark): Which statement is correct for the two structures below? A They have the same empirical formula. B They have different relative molecular masses. C They are str
November 2020, AS Paper 1, Q25(c)(iv) (2 marks): But-1-yne is a structural isomer of C4H6. Draw the structures of 2 other structural isomers of C4H6. [2]
June 2019, Paper 2, Q16(b)(iii) (1 mark): Explain why geraniol and citronellal are structural isomers of each other. [1]
June 2018, Paper 2, Q11 (1 mark): How many straight-chain structural isomers of C7H15Cl contain a chiral carbon atom? A 1 B 2 C 3 D 4 Your answer [1]
June 2018, AS Paper 1, Q16 (1 mark): How many structural isomers of C6H14O are tertiary alcohols? A 1 B 2 C 3 D 4 Your answer [1]
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 2018, AS Paper 1, Q24(b)(ii) (2 marks): Complete the table to show the number of structural isomers of C5H11Cl that could be formed from the reaction of chlorine with A and B. A B Number of structural
June 2017, Paper 2, Q15 (1 mark): Which compound(s) is a/are structural isomer(s) of C6H12O2? 1 hexanoic acid 2 ethyl butanoate 3 propyl propanoate A 1, 2 and 3 B Only 1 and 2 C Only 2 and 3 D O
June 2017, AS Paper 1, Q16 (1 mark): How many structural isomers have the molecular formula C5H12? A 2 B 3 C 4 D 5 Your answer [1]
June 2017, AS Paper 2, Q5(c) (4 marks): Compound D is a neutral compound which is a structural isomer of propanoic acid, CH3CH2COOH. The infrared spectrum of compound D is shown below. Item removed du
June 2016, AS Paper 1, Q13 (1 mark): The skeletal formulae of four alcohols, E, F, G and H, are shown below. OH OH E F OH HO G H Which pair of alcohols are structural isomers of each other? A E and

Nearby topics:4.1.1.1 Naming and representing organic compounds 4.1.1.2 Homologous series and functional groups 4.1.1.4 Bond fission and radicals 4.1.1.5 Curly arrows and reaction mechanisms The whole bank

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