Alkenes: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.3.4 Alkenes, 2016–2025, with its mark scheme and examiner’s report.

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2,301 questions

Q01.5
June 2025 · Paper 2
2 marks3.3.4 Alkenes
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Q02.3
June 2025 · Paper 2
2 marks3.3.4 Alkenes
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Q03.1
June 2025 · Paper 2
2 marks3.3.4 Alkenes
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Q03.2
June 2025 · Paper 2
1 mark3.3.4 Alkenes
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Q03.3
June 2025 · Paper 2
1 mark3.3.4 Alkenes
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Q13
June 2025 · Paper 3
1 mark3.3.4 Alkenes
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Q36
June 2025 · Paper 3
1 mark3.3.4 Alkenes
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Q04.3
June 2025 · AS Paper 2
1 mark3.3.4 Alkenes
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Q06.1
June 2025 · AS Paper 2
1 mark3.3.4 Alkenes
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Q06.2
June 2025 · AS Paper 2
3 marks3.3.4 Alkenes
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Q08.1
June 2024 · Paper 2
2 marks3.3.4 Alkenes
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Q09.3
June 2024 · Paper 2
3 marks3.3.4 Alkenes 3.3.11 Amines
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Q04.2
June 2024 · AS Paper 2
5 marks3.3.4 Alkenes
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Q04.3
June 2024 · AS Paper 2
3 marks3.3.4 Alkenes
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Q15
June 2024 · AS Paper 2
1 mark3.3.4 Alkenes
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Q04.2
June 2023 · Paper 2
6 marks3.3.4 Alkenes
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Q31
June 2023 · Paper 3
1 mark3.3.4 Alkenes
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Q04.1
June 2023 · AS Paper 2
5 marks3.3.4 Alkenes
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Q04.2
June 2023 · AS Paper 2
4 marks3.3.4 Alkenes
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Q04.3
June 2023 · AS Paper 2
1 mark3.3.4 Alkenes
The whole paper ↗

All 78 questions on Alkenes, as a list

June 2025, Paper 2, Q01.5 (2 marks): Identify the reagent and name the mechanism for reaction 3. [2 marks] Reagent Name of mechanism
June 2025, Paper 2, Q02.3 (2 marks): Figure 1 shows part of the mechanism when L reacts with hydrogen bromide. Figure 1 Complete Figure 1 to show the next step in the mechanism that gives the major
June 2025, Paper 2, Q03.1 (2 marks): A section of the polymer PVC is shown. Name the monomer used to make PVC. Draw the structure of the monomer used to make PVC. [2 marks] Monomer name Structure
June 2025, Paper 2, Q03.2 (1 mark): State why PVC is not biodegradable. [1 mark]
June 2025, Paper 2, Q03.3 (1 mark): Diisobutyl phthalate (DIBP) is a plasticiser added to PVC to modify its properties. State how the properties of PVC are modified by the addition of DIBP. [1 mar
June 2025, Paper 3, Q13 (1 mark): Compound X reacts with concentrated sulfuric acid to produce compound Y. Compound Y reacts with an excess of water to produce an alcohol. Which compound could b
June 2025, Paper 3, Q36 (1 mark): The hydration of 1-methylcyclopent-1-ene uses a catalyst of sulfuric acid and produces a mixture of products. Which ion is formed during the mechanism for this
June 2025, AS Paper 2, Q04.3 (1 mark): Vinyl acetate (VA) has the molecular formula C4H6O2 The structure of vinyl acetate is shown. PVA is an addition polymer of vinyl acetate. Draw the repeating uni
June 2025, AS Paper 2, Q06.1 (1 mark): Complete the equation for the conversion of cyclohexene to cyclohexanol in this reaction. [1 mark]
June 2025, AS Paper 2, Q06.2 (3 marks): Complete the mechanism for this reaction by adding curly arrows in the relevant places. [3 marks]
June 2024, Paper 2, Q08.1 (2 marks): Name the mechanism in Step 1. State the reagent(s) used for Step 1. [2 marks] Name of mechanism Reagent(s)
June 2024, Paper 2, Q09.3 (3 marks): Figure 3 shows a two-step synthesis to make amine G. Figure 3 Complete Figure 3 by drawing the mechanism for Step 1 and the displayed formula of amine G. [3 mar
June 2024, AS Paper 2, Q04.2 (5 marks): Compound J reacts with hydrogen bromide to form compounds K and L. K is the major product. Name and outline the mechanism for the formation of K. [5 marks] Name
June 2024, AS Paper 2, Q04.3 (3 marks): Explain why compound K is the major product in the reaction in Question 04.2. [3 marks]
June 2024, AS Paper 2, Q15 (1 mark): Which is the structure of poly(1-chloropropene)? [1 mark] A B C D
June 2023, Paper 2, Q04.2 (6 marks): Reaction 1 produces a mixture of W and two other isomers. Draw the structures of the two other isomers. Explain, by considering the mechanism of this reaction,
June 2023, Paper 3, Q31 (1 mark): Compound X can be converted into an alcohol in a two-stage process. What is the name of compound X? [1 mark] A propene B propanal C methylbenzene D ethanamide
June 2023, AS Paper 2, Q04.1 (5 marks): 1-Methylcyclohexene reacts with HBr to form two structural isomers. The major product is 1-bromo-1-methylcyclohexane. Name and outline the mechanism for the for
June 2023, AS Paper 2, Q04.2 (4 marks): Draw the skeletal formula of the minor product formed in the reaction in Question 04.1. Explain why the products are formed in different amounts. [4 marks] Skel
June 2023, AS Paper 2, Q04.3 (1 mark): Draw the structure of the major product when an excess of HBr reacts with limonene. [1 mark]
June 2023, AS Paper 2, Q09 (1 mark): Which monomer forms this polymer? [1 mark] A but-1-ene B E-but-2-ene C Z-but-2-ene D methylpropene
June 2023, AS Paper 2, Q15 (1 mark): Which reaction results in an overall change in shape around a carbon atom? [1 mark] A oxidation of propanal with acidified potassium dichromate(VI) B polymerisa
June 2022, Paper 2, Q03.1 (5 marks): Name the mechanism for the reaction of 2-methylbut-1-ene with concentrated sulfuric acid. Outline the mechanism for this reaction to form the major product. [5
June 2022, Paper 2, Q03.2 (3 marks): Draw the structure of the minor product formed in the reaction in Question 03.1 Explain why this is the minor product. [3 marks] Structure of minor product Expl
June 2022, AS Paper 2, Q07.6 (5 marks): Name and outline a mechanism to show the conversion of but-1-ene into compound W in the first part of this process. [5 marks] Name of mechanism Outline of mecha
June 2022, AS Paper 2, Q07.7 (2 marks): There is a very low yield of butan-1-ol from but-1-ene in this manufacturing process. Explain why. [2 marks] Section B Answer all questions in this section. Onl
June 2022, AS Paper 2, Q10 (1 mark): Which statement about poly(ethene) is correct? [1 mark] A It has a lower relative molecular mass than ethene. B It has a lower density than ethene at standard t
June 2022, AS Paper 2, Q11 (1 mark): A polymer is formed from the monomer CH2=CHCN Which statement is not correct? [1 mark] A The monomer is propanenitrile. B The monomer is unsaturated. C The poly
November 2021, Paper 2, Q08.2 (4 marks): State the reagents needed and give equations for step 2 and step 3. Show the structure of Compound G in your equations. [4 marks] Step 2 reagent Step 2 equation
November 2021, AS Paper 2, Q02.1 (5 marks): Name and outline the mechanism for the reaction of cyclohexene with Br2 [5 marks] Name of mechanism Outline of mechanism
November 2021, AS Paper 2, Q02.2 (3 marks): Explain why there is an attraction between a C=C double bond and Br2 [3 marks]
November 2021, AS Paper 2, Q02.3 (1 mark): Draw the skeletal formula of the halogenoalkane formed when buta-1,3-diene (CH2=CHCH=CH2) reacts with an excess of Br2 [1 mark]
November 2021, AS Paper 2, Q05.2 (1 mark): Poly(propene) is not biodegradable because it is unreactive. Explain why poly(propene) is unreactive. [1 mark]
November 2021, AS Paper 2, Q05.3 (1 mark): Scientists are developing new polymers, including some that are biodegradable. Suggest why it is beneficial for some polymers to be biodegradable. [1 mark]
November 2021, AS Paper 2, Q07.3 (1 mark): Prop-2-en-1-ol forms an addition polymer. Draw the repeating unit of poly(prop-2-en-1-ol). [1 mark]
November 2021, AS Paper 2, Q18 (1 mark): Which compound reacts with hydrogen bromide to give 2-bromo-3-methylbutane as the major product? [1 mark] A (CH3)2C=CHCH3 B (CH3)2C=CH2 C CH2=C(CH3)CH2CH3 D (CH
November 2020, Paper 2, Q06.4 (1 mark): Draw the repeating unit of polystyrene. [1 mark]
November 2020, Paper 3, Q24 (1 mark): Which compound decolourises bromine water in the absence of sunlight? [1 mark] A CH3CH2CH2Br B C D CH3CH2CHCH2
November 2020, Paper 3, Q28 (1 mark): Which compound reacts with hydrogen bromide to give 2-bromo-3-methylbutane as the major product? [1 mark] A (CH3)2C=CHCH3 B CH3(CH2)2CH=CH2 C CH3CH2C(CH3)=CH2 D
November 2020, AS Paper 2, Q06.1 (3 marks): Give an equation, showing structural formulas, for the conversion of chloroethene into poly(chloroethene). [3 marks]
November 2020, AS Paper 2, Q06.2 (2 marks): State what you would observe if bromine water was added to poly(chloroethene). Explain this observation. [2 marks] Observation Explanation
November 2020, AS Paper 2, Q06.3 (2 marks): Plasticisers are often added during the manufacture of PVC. The structure of the plasticiser DEHP is shown. Deduce the molecular formula of DEHP and state why a
November 2020, AS Paper 2, Q12 (1 mark): What is the IUPAC name of the major product of the reaction between 2-ethylbut-1-ene and hydrogen bromide? [1 mark] A 1-bromo-2-ethylbutane B 2-bromo-2-ethylbut
November 2020, AS Paper 2, Q15 (1 mark): In which reaction does the inorganic reagent act initially as an electrophile? [1 mark] A bromoethane with ethanolic potassium hydroxide B chloroethane with aqu
June 2019, Paper 2, Q02.5 (3 marks): Cyclohexene reacts with bromine. Complete the mechanism for this reaction. [3 marks]
June 2019, Paper 2, Q03.1 (4 marks): Deduce the molecular formula of isoprene and suggest a possible structure. [4 marks] Molecular formula Structure
June 2019, Paper 2, Q03.3 (2 marks): A second polymer in the mixture has a repeating unit with the structure shown. The third polymer in the mixture is a stereoisomer of this polymer. Draw the stru
June 2019, Paper 2, Q11.3 (2 marks): The compound C19H34O2 is the methyl ester of Z,Z-octadeca-9,12-dienoic acid. Part of the structure of the acid is shown. Complete the skeletal formula to show t
June 2019, Paper 3, Q04.4 (1 mark): Draw a section of the polymer polyacrylonitrile, showing three repeating units. [1 mark]
June 2019, Paper 3, Q33 (1 mark): Which alkene reacts with hydrogen bromide to give 2-bromo-3-methylbutane as the major product? [1 mark] A (CH3)2C=CHCH3 B CH3CH2CH=CHCH3 C CH3CH2C(CH3)=CH2 D (C
June 2019, AS Paper 2, Q06.1 (5 marks): Name and outline the mechanism for the formation of E in this reaction. [5 marks] Name of mechanism Mechanism
June 2019, AS Paper 2, Q06.2 (1 mark): Draw the structure of F. [1 mark]
June 2019, AS Paper 2, Q06.3 (2 marks): Explain why more of isomer E than isomer F is formed in this reaction. [2 marks]
June 2019, AS Paper 2, Q17 (1 mark): Which statement is not correct about CH2═C(CH3)CH2Br? [1 mark] A It displays E-Z isomerism. B It forms an addition polymer. C It reacts with electrophiles. D It
June 2018, Paper 2, Q03.6 (2 marks): A pair of stereoisomers is also formed in the reaction in Question 03.5. Name the less polar stereoisomer formed. Explain how this type of stereoisomerism arise
June 2018, Paper 3, Q03.2 (2 marks): Describe a test-tube reaction, on the product, to show that the cyclohexanol had been dehydrated. State what you would observe. [2 marks]
June 2018, AS Paper 2, Q04.6 (1 mark): The main use of propene, formed from cracking, is to make poly(propene). Draw the repeating unit of poly(propene). [1 mark]
June 2018, AS Paper 2, Q05.1 (6 marks): A hydrocarbon contains 87.8% by mass of carbon and has a relative molecular mass (Mr) of 82.0 The hydrocarbon decolourises bromine water. Determine the empirica
June 2018, AS Paper 2, Q11 (1 mark): Which is the major product of the reaction between 2-methylbut-2-ene and iodine monochloride (ICl)? [1 mark] A B C D
June 2018, AS Paper 2, Q19 (1 mark): Which statement is correct about poly(chloroethene)? [1 mark] A It has the empirical formula CHCl B It decolourises bromine water. C Its brittleness is reduced
June 2017, Paper 3, Q02.1 (1 mark): Name the mechanism for the reaction of concentrated sulfuric acid with an alkene. [1 mark]
June 2017, Paper 3, Q02.2 (4 marks): Outline the mechanism for the reaction of concentrated sulfuric acid with propene to show the formation of the major product. [4 marks]
June 2017, Paper 3, Q02.3 (1 mark): Draw the structure of the minor product of the reaction between concentrated sulfuric acid and propene. [1 mark] 7
June 2017, Paper 3, Q02.4 (2 marks): Explain why the product shown in your answer to Question 2.2 is the major product. [2 marks]
June 2017, Paper 3, Q18 (1 mark): This structure shows a section of a polymer chain formed from the random polymerisation of two different monomers. Which pair of monomers could produce this pol
June 2017, AS Paper 2, Q08.2 (1 mark): Draw the displayed formula of C5H11Br that is the major product of the reaction of 2-methylbut-2-ene with hydrogen bromide. [1 mark]
June 2017, AS Paper 2, Q08.3 (1 mark): Thermal cracking of hydrocarbons produces molecules that are attacked by electrophiles because they have a region of high electron density. Draw the structure o
June 2017, AS Paper 2, Q09.2 (1 mark): This structure shows a molecule that has been used as a plasticiser in PVC. Deduce the number of hydrogen atoms in this molecule. [1 mark]
June 2017, AS Paper 2, Q09.3 (1 mark): Use your understanding of the properties of PVC to explain whether you would expect to find a plasticiser in the PVC used to insulate electrical cables. [1 mark
June 2017, AS Paper 2, Q09.4 (1 mark): A section of the polymer poly(chloroprene), a synthetic rubber, is shown. Draw the displayed formula for the repeating unit of poly(chloroprene). [1 mark] Secti
June 2016, AS Paper 2, Q03.7 (2 marks): Oleic acid (C18H34O2) is a straight-chain fatty acid obtained from plant oils. Isooctane can be made from oleic acid. The skeletal formula of oleic acid is show
June 2016, AS Paper 2, Q07.2 (7 marks): Name and outline the mechanism for the formation of 3-bromo-3-methylpentane from this reaction of 3-methylpent-2-ene with hydrogen bromide. Explain why more 3-b
June 2016, AS Paper 2, Q15 (1 mark): The repeating unit of a polymer is Which of the following molecules would form a polymer containing this repeating unit? [1 mark] A But-1-ene B E-but-2-ene C Z-
Specimen, Paper 2, Q07.1 (2 marks): Monomer Type of polymerisation
Specimen, Paper 2, Q12.1 (1 mark): 12 But-1-ene reacts with a reagent of the form HY to form a saturated compound. Suggest a reagent of the form HY which reacts with but-1-ene. [1 mark] 1 2 . 1
Specimen, Paper 2, Q12.2 (5 marks): Name of mechanism Mechanism
Specimen, Paper 2, Q12.3 (3 marks): 12 But-1-ene reacts with a reagent of the form HY to form a saturated compound. Explain how three isomeric products are formed when HY reacts with but-1-ene. [3
Specimen, Paper 3, Q27 (1 mark): What is the major product of the reaction between but-1-ene and DBr? (D is deuterium and represents 2H) [1 mark] A CH2DCH2CH2CH2Br B CH2DCH2CHBrCH3 C CH3CH2CHBr

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