plumiAddition reactions of alkenes: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.1.3.3 Addition reactions of alkenes, 2016–2025, with mark schemes and examiner’s reports where available.
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Q16(e)
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All 25 questions on Addition reactions of alkenes, as a list
- June 2025, Paper 2, Q16(e) (3 marks): The flowchart below shows some reactions of compound C. Complete the flowchart to show the missing reagent, catalyst and the structures of the organic products.
- June 2024, Paper 2, Q2 (1 mark): Hydrogen reacts much more readily with alkenes than with alkanes. Why is this? A Alkenes are polar molecules whereas alkanes are not. B All atoms in an alkane h
- June 2024, AS Paper 2, Q5(a) (4 marks): Complete the flowchart for the reactions of but-1-ene, by adding the structures of the organic products in each box. Br2 H2 / Ni H CH2CH3 C C H H but-1-ene H2O(
- June 2023, AS Paper 1, Q25(c) (4 marks): Alkenes are used in organic synthesis. Three reactions of an alkene are shown in the flowchart. Complete the flowchart to show the missing reagents, catalysts a
- June 2022, Paper 2, Q16(c)(i) (2 marks): Draw the structures of the products you would expect from the ozonolysis of the two compounds below. [2]
- June 2022, Paper 2, Q20(e) (4 marks): 1-phenylethanol is a naturally occurring compound found in many vegetables and flowers. 1-phenylethanol can be synthesised from 2-phenylethanol in two stages. H
- November 2021, Paper 2, Q16(b)(iii) (1 mark): Buta-1,3-diene is reacted with an excess of hydrogen bromide, forming a mixture of saturated organic products. How many saturated organic products could be pres
- November 2021, Paper 2, Q16(d)(ii) (2 marks): Two more Diels-Alder reactions of buta-1,3-diene are shown below. In the boxes, draw the organic product of each reaction. O OCH3 + OCH3 O + [2]
- November 2020, Paper 2, Q17(a)(i) (2 marks): Draw the structures of the organic product of each reaction. Organic product with B Organic product with C [2]
- November 2020, AS Paper 1, Q25(a) (3 marks): Two reactions of propene are shown below. In the boxes, show the structures of the organic products of the reactions. H CH3 polymerisation C C H H one repeat un
- November 2020, AS Paper 1, Q25(c)(iii) (2 marks): Propyne reacts with bromine to form a saturated compound. Write an equation for the reaction, showing the structure of the organic product. [2]
- June 2019, Paper 2, Q5 (1 mark): Which types of bonds are broken and formed in the reaction of ethene and bromine? Types of bond broken Types of bond formed A σ π B π σ C σ and π π D σ and π σ
- June 2019, Paper 3, Q4(b)(iii) (4 marks): α-Terpineol contains two functional groups. For each functional group, choose a reagent that reacts with that group only. Draw the structures for the organic pr
- June 2019, AS Paper 2, Q5(a)(i) (3 marks): Complete the flowchart to show the structures of the organic products of these reactions. major product Reaction 1 H2 HCl Reaction 2 hex-1-ene Br2 Reaction 3 [3
- June 2019, AS Paper 2, Q5(a)(ii) (1 mark): State the catalyst needed in reaction 1. [1]
- June 2019, AS Paper 2, Q5(a)(iii) (1 mark): What would you observe in reaction 3? [1]
- June 2018, Paper 2, Q16(c) (3 marks): The flowchart below shows some reactions of compound C. In the boxes, draw the organic products of these reactions. excess CH3OH/H2SO4 Steam COOH HOOC H3PO4 com
- June 2018, AS Paper 1, Q18 (1 mark): A student reacts pent-2-ene with bromine in the laboratory. Which compound is formed? A 1,1-dibromopentane B 1,2-dibromopentane C 2,2-dibromopentane D 2,3-dibro
- June 2018, AS Paper 2, Q6(a) (1 mark): State the reagents and conditions for reaction 1. [1]
- June 2017, Paper 2, Q16(e)(i) (2 marks): Reaction of 204 mg of myrcene with hydrogen gas produces a saturated alkane. Calculate the volume of hydrogen gas, in cm3 and measured at RTP, needed for this r
- June 2017, Paper 2, Q16(e)(ii) (4 marks): β-Carotene is a naturally occurring unsaturated hydrocarbon found in carrots. A β-carotene molecule contains 40 carbon atoms, has two rings, and a branched chai
- June 2017, AS Paper 1, Q21(a)(i) (3 marks): Complete the flowchart to show the organic products formed in the reactions. Cl Cl H Br2 H2/ Ni C C H3C H 2-chloropropene steam major product [3]
- June 2017, AS Paper 1, Q21(a)(ii) (1 mark): The reaction of 2-chloropropene with steam requires a catalyst. State a suitable catalyst for this reaction. [1]
- June 2016, AS Paper 1, Q26(a)(ii) (1 mark): What reagents and conditions are needed to convert compound B into a saturated hydrocarbon? [1]
- June 2016, AS Paper 1, Q26(c)(ii) (3 marks): A student plans a two-stage synthesis for preparing compound F from compound B. The synthesis first prepares compound E, as shown in the flowchart. Draw the str
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