plumiAddition reactions of alkenes and the bromine water test: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 5.2.1 Addition reactions of alkenes and the bromine water test, 2019–2025, with mark schemes and examiner’s reports where available.
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Q20(a)(iv)
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All 69 questions on Addition reactions of alkenes and the bromine water test, as a list
- June 2025, Unit 5, Q20(a)(iv) (2 marks): In Step Y a diol is formed as an intermediate before further oxidation. The mixture is heated so the reaction can proceed. Suggest the reagents required to form
- June 2025, Unit 5, Q20(a)(v) (1 mark): Suggest a reason why it is unlikely the reaction scheme proceeds by this route in plants. (1)
- January 2025, AS Unit 1, Q17 (1 mark): Bromine and bromine water can be used to test for a carbon‑carbon double bond. When bromine water reacts with 2‑methylbut‑2‑ene, there is one major organic prod
- January 2025, AS Unit 1, Q24(b) (1 mark): A few drops of a purple solution of acidified potassium manganate(VII) were added to a sample of liquid X and shaken. The solution remained purple. State what c
- October 2024, AS Unit 3, Q3(b)(i) (1 mark): The purified product was treated with a small volume of bromine water and shaken. The bromine water was not decolourised. State the most likely conclusion that
- October 2024, Unit 5, Q19(d) (1 mark): The second step of the industrial preparation of the raspberry ketone involves the reduction shown. O O H2 catalyst HO HO Suggest why the choice of reducing age
- June 2024, AS Unit 1, Q3(b) (1 mark): Limonene is completely hydrogenated by hydrogen in the presence of a nickel catalyst. What is the empirical formula of the product formed? (1) A C5H11 B C5H9 C
- June 2024, AS Unit 1, Q19(b)(i) (1 mark): The degree of unsaturation can be determined by the reaction with bromine water. Name the type of reaction. (1) Data using 0.5 g of some unsaturated fat in this
- June 2024, AS Unit 1, Q19(b)(ii) (3 marks): Plot a graph of the data. Include a line of best fit. (3)
- June 2024, AS Unit 1, Q19(b)(iii) (1 mark): Data for the bromination of 0.5 g samples of a margarine are shown. Volume of 0.0625 mol dm–3 Trial bromine water / cm3 1 36.9 2 34.1 3 39.3 4 32.5 Calculate th
- June 2024, AS Unit 1, Q19(b)(iv) (1 mark): Determine the average number of C C bonds per molecule of the unknown sample to 2 significant figures, using your graph. (1)
- June 2024, AS Unit 2, Q19(a) (1 mark): The hydration of ethene requires a catalyst which is coated onto a solid silicon dioxide support. Identify, by name or formula, the catalyst used. (1)
- June 2024, AS Unit 2, Q20(b)(ii) (1 mark): Both myrcene and limonene can be completely hydrogenated by reaction with hydrogen. State the conditions required for hydrogenation of alkenes. (1)
- June 2024 (R), AS Unit 3, Q3(e)(i) (2 marks): Describe a laboratory test that could be used to distinguish between solutions of these acids. (2)
- January 2024, AS Unit 3, Q1(b) (4 marks): Describe a chemical test and the expected positive result for both functional group 2 and functional group 3. (4) Functional group 2 Test Result Functional grou
- October 2023, AS Unit 1, Q11 (1 mark): Ethene reacts with acidified potassium manganate(VII). A student makes four statements about the reaction. • the organic product can show geometric isomerism •
- October 2023, AS Unit 1, Q20(c)(iii) (1 mark): Deduce the number of carbon-carbon double bonds in a molecule of α-bisabolene, using your answers to (c)(i) and (c)(ii). (1)
- October 2023, AS Unit 2, Q21(a)(iii) (2 marks): Reagents were added to separate samples of X to identify the functional groups in the molecule. Complete Table 1. (2) Table 1 Reagent Observation Functional gro
- October 2023, AS Unit 2, Q21(c)(i) (2 marks): Suggest suitable reagents and conditions for the conversion of propene to propane‑1,2‑diol. (2)
- October 2023, AS Unit 3, Q3(h) (2 marks): Separate samples of cyclohexanol and the cyclohexene product were tested with phosphorus(V) chloride and with bromine water. Complete the table to show the obse
- October 2023, Unit 5, Q20(a)(ii) (6 marks): Compare and contrast the reaction of benzene with bromine with the reactions of cyclohexene with bromine and of phenol with bromine. Include reasons for any dif
- June 2023, AS Unit 3, Q3(b)(ii) (2 marks): Give a chemical test, including the expected result, to confirm the presence of the C C double bond in but‑1‑ene. (2)
- January 2023, AS Unit 1, Q22(a)(i) (1 mark): Identify, by name or formula, the catalyst needed for Reaction 1. . (1)
- January 2023, AS Unit 1, Q22(a)(ii) (1 mark): Name product A. (1)
- January 2023, AS Unit 1, Q22(a)(iii) (2 marks): Identify, by name or formula, the substances needed for Reaction 2. (2)
- January 2023, AS Unit 1, Q22(a)(iv) (1 mark): Draw the displayed formula of product B. (1)
- January 2023, AS Unit 2, Q20(a) (1 mark): Identify, by name or formula, the reagent used in Step X. (1)
- January 2023, AS Unit 3, Q1(a) (2 marks): P has the molecular formula C6H12. P is a straight‑chain molecule that contains one functional group. Bromine water is decolourised when shaken with P. Identify
- October 2022, AS Unit 1, Q17(b)(i) (1 mark): A few drops of acidified potassium manganate(VII) solution are mixed with a sample of limonene. State the colour change. (1) From to
- October 2022, AS Unit 1, Q17(b)(ii) (1 mark): Draw the skeletal formula of the structure of the organic product formed when the reaction in (b)(i) is carried out with excess acidified potassium manganate(VI
- October 2022, AS Unit 1, Q17(b)(iii) (1 mark): Name the type of reaction that limonene undergoes in (b)(i). . (1)
- October 2022, AS Unit 2, Q23(d)(i) (2 marks): For Reaction 1, give the name or formula of a suitable reagent, stating the conditions for the reaction. (2) Reagent Conditions
- October 2022, AS Unit 2, Q23(d)(ii) (2 marks): For Reaction 2, give the name or formula of a suitable reagent, stating the type of reaction taking place. (2) Reagent Type of reaction
- October 2022, AS Unit 2, Q23(d)(iii) (2 marks): For Reaction 3, give the name or formula of a suitable reagent, writing an equation for the reaction taking place. (2) Reagent Equation
- 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
- June 2022, AS Unit 1, Q22(d)(i) (1 mark): Identify the catalyst, by name or formula. (1)
- June 2022, AS Unit 3, Q3(g)(i) (2 marks): State a chemical test and the expected observation for a C C double bond. (2)
- June 2022, Unit 6, Q4(c)(i) (1 mark): Give the colour change for this reaction. (1)
- June 2022, Unit 6, Q4(c)(ii) (1 mark): Draw the structure of the organic product which might be expected when excess acidified potassium manganate(VII) reacts with limonene. (1)
- January 2022, AS Unit 1, Q21(b)(i) (3 marks): In each box, draw the structure of the organic product of the reaction. (3)
- January 2022, AS Unit 1, Q21(c)(iv) (3 marks): In an experiment, 0.050 mol of alpha-ocimene reacted with 3.6 dm3 of hydrogen, H2 , in the presence of a catalyst. Deduce the structure of the product of this r
- October 2021, AS Unit 1, Q15(b)(iii) (4 marks): Some reactions of but-1-ene are shown. Product 1 Cl2 steam / H+ H2 / Ni Product 4 Product 2 CH3CH2CH CH2 KMnO4 / H+ Product 3 Give the name and structural formu
- October 2021, AS Unit 3, Q2(a) (4 marks): Geraniol has two different types of functional group. Name the functional groups, giving a chemical test and its positive result to show the presence of each gr
- October 2021, AS Unit 3, Q2(f)(i) (1 mark): State the essential condition required for this reaction. (1)
- October 2021, AS Unit 3, Q2(f)(ii) (1 mark): Draw the skeletal formula of the product of this reaction. (1) OH geraniol
- October 2021, Unit 5, Q19(a) (2 marks): Describe a chemical test, including the result, that could distinguish the Dewar structure from benzene. (2)
- June 2021, AS Unit 1, Q23(c)(i) (1 mark): Draw the skeletal formula of compound X formed in Reaction 1. (1)
- June 2021, AS Unit 1, Q23(c)(ii) (2 marks): Give the reagent and condition needed for Reaction 2. (2) Reagent ………………………………………………………………………………………………………………………………………………… Condition …………………………………………………………………………
- June 2021, AS Unit 1, Q23(f) (4 marks): 0.0100 mol of an alkene reacts completely with exactly 600 cm3 of hydrogen gas, measured at 298 K and 1.24 × 105 Pa pressure, to form an alkane. Use the ideal g
- June 2021, AS Unit 3, Q2(b)(i) (2 marks): Give a chemical test to show the presence of the carbon-carbon double bond in Z-hex-3-en-1-ol, including the expected result. (2)
- June 2021, AS Unit 3, Q2(b)(ii) (1 mark): The test you have given in (b)(i) is repeated with 1-methylcyclopentanol. Give the observation for this test with 1-methylcyclopentanol. (1)
- January 2021, AS Unit 1, Q20(b) (2 marks): State one similarity and one difference that would be seen when propene is mixed with separate samples of acidified potassium manganate(VII) solution and of bro
- January 2021, AS Unit 1, Q21(c)(i) (1 mark): Give the name of a suitable catalyst for the hydrogenation of squalene. (1)
- January 2021, AS Unit 1, Q21(c)(iv) (1 mark): Write the equation, using molecular formulae, for the complete hydrogenation of squalene to squalane. State symbols are not required. (1)
- October 2020, AS Unit 1, Q21(b)(i) (2 marks): State the colour change when an excess of cyclohexene is added to liquid bromine. (2)
- October 2020, AS Unit 2, Q12(b) (1 mark): Compound L can be converted into compound M. OH Cl M Cl Which reagent should be used? (1) A Cl2(g) B HCl(g) C PCl5(s) D KCl(aq)
- October 2020, AS Unit 3, Q3(b) (4 marks): The organic liquid H is a pheromone thought to be involved in communication between rabbits. H O H3C CH3 State the initial and final appearance of each mixture
- January 2020, AS Unit 1, Q21(d)(ii) (1 mark): Compound Y reacts with water to form compound Z. Compound Z is also produced in the reaction between ethene and acidified potassium manganate(VII). Give the dis
- January 2020, AS Unit 1, Q21(e) (1 mark): Ethene reacts with buta-1,3-diene to form cyclohexene as the only product. Complete the equation for the formation of cyclohexene from ethene and buta-1,3-diene
- January 2020, AS Unit 1, Q21(f)(i) (1 mark): Classify the type of reaction occurring in Reaction 1. (1)
- January 2020, AS Unit 1, Q21(f)(ii) (2 marks): Give the reagents and conditions needed for Reaction 2. (2)
- January 2020, AS Unit 3, Q1(d) (2 marks): Acidified potassium manganate(VII) solution was added to separate test tubes containing samples of hexane and hexene. The test tubes were shaken gently. State w
- June 2019, AS Unit 1, Q16 (1 mark): What is the name of the product when this molecule reacts with chlorine gas? A 5,5-dichloro-2-methylpentane B 4,5-dichloro-2-methylpentane C 2,3-dichloro-4-meth
- June 2019, AS Unit 1, Q18 (1 mark): What reagent and conditions are used for this conversion? H H H H C C HO C C H H H H H A potassium manganate(VII) in aqueous acid B sodium hydroxide in dilute a
- June 2019, AS Unit 1, Q22(c)(ii) (2 marks): Give a test for alkenes, including the positive result. (2)
- June 2019, AS Unit 3, Q2(d)(i) (1 mark): State the colour change when the alkene reacts with bromine. (1)
- January 2019, AS Unit 1, Q23(d)(i) (1 mark): In Reaction 1 the reagent A is acidified potassium manganate(VII). Give the skeletal formula of organic product Q. (1)
- January 2019, AS Unit 1, Q23(d)(ii) (1 mark): Give the colour change seen during Reaction 1. (1) From to
- January 2019, AS Unit 1, Q23(d)(iii) (1 mark): Identify, by name or formula, reagent B in Reaction 2. (1)
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