plumiHalogenoalkanes: Edexcel A‑Level Chemistry questions
Every Edexcel A-Level Chemistry exam question on 6D Halogenoalkanes, 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q4(c)
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Q4(a)
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Q1(a)
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Q1(c)(i)
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Q1(c)(ii)
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Q5(d)(i)
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Q5(d)(ii)
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Q5(d)(iii)
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Q7(b)
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Q4(a)(i)
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Q4(a)(ii)
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Q4(a)(iii)
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Q4(b)
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Q4(c)(i)
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Q4(c)(ii)
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Q4(d)(i)
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Q4(d)(ii)
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Q4(d)(iii)
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Q3(b)
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Q10(d)(ii)
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All 59 questions on Halogenoalkanes, as a list
- June 2025, Paper 2, Q4(c) (1 mark): Which process does not involve heterolytic fission? (1) A the formation of the cyanide nucleophile from KCN B the formation of propanenitrile from bromoethane C
- June 2025, AS Paper 2, Q4(a) (3 marks): Butan-1-ol can be produced from the reaction of aqueous potassium hydroxide with 1-bromobutane. Draw the reaction mechanism for this reaction. Include curly arr
- June 2024, Paper 2, Q1(a) (1 mark): Equal amounts of four bromoalkanes were added to separate test tubes containing 2 cm3 of a silver nitrate solution. The mixtures were heated in a water bath. Wh
- June 2024, Paper 2, Q1(c)(i) (3 marks): Explain, by referring to the reaction mechanism, the roles of ammonia in the formation of each of the products of this reaction. (3)
- June 2024, Paper 2, Q1(c)(ii) (1 mark): What conditions are needed for this reaction? (1) Method of heating Solvent A heat in a sealed tube ethanol B heat under reflux ethanol C heat in a sealed tube
- June 2024, Paper 2, Q5(d)(i) (2 marks): Explain why the solvent ethanol is treated with anhydrous sodium sulfate before use in this reaction. (2)
- June 2024, Paper 2, Q5(d)(ii) (1 mark): Give the name of the reaction shown in the equation. (1)
- June 2024, Paper 2, Q5(d)(iii) (1 mark): Predict the mechanism for the reaction by adding two curly arrows. (1) H Br + Br– + H2O :OH– H H
- June 2024, Paper 3, Q7(b) (5 marks): Devise a reaction scheme for Step 2 and Step 3 of the synthesis. Include in your answer all reagents and conditions, the type of reaction in each step, and the
- June 2023, AS Paper 2, Q4(a)(i) (3 marks): Give three reasons why these reaction conditions are specified. (3)
- June 2023, AS Paper 2, Q4(a)(ii) (2 marks): Explain why a precipitate forms. (2)
- June 2023, AS Paper 2, Q4(a)(iii) (1 mark): The three halogenoalkanes were placed in order of increasing rate of reaction. Which is the correct sequence? (1) A X, Y, Z B X, Z, Y C Y, X, Z D Z, Y, X
- June 2023, AS Paper 2, Q4(b) (1 mark): The results table shows the time taken to produce a precipitate when three bromoalkanes react with aqueous ethanolic silver nitrate solution. Time to produce a
- June 2023, AS Paper 2, Q4(c)(i) (1 mark): Which equation shows the first step of the mechanism for the reaction of 1‑bromopropane with ammonia? (1) δ+ δ– CH3 CH2 CH2 Br CH3 CH2 CH2 NH2 + HBr A • •NH3 δ+
- June 2023, AS Paper 2, Q4(c)(ii) (1 mark): Write the formula of the final inorganic product of the reaction of 1‑bromopropane with excess ammonia. (1)
- June 2023, AS Paper 2, Q4(d)(i) (2 marks): Give two reasons why organic reactions are often heated for a long time but the yield is frequently low. (2)
- June 2023, AS Paper 2, Q4(d)(ii) (2 marks): Give the name or formula of the reagent and the condition, other than heat, used to increase the carbon chain length by one carbon atom, starting from 1-bromopr
- June 2023, AS Paper 2, Q4(d)(iii) (2 marks): 1-bromopropane, CH3CH2CH2CH2Br, can be converted into but-1-ene, CH3CH2CH CH2 . Give the name or formula of the reagent and the condition, other than heat, used
- June 2022, Paper 2, Q3(b) (1 mark): What is the classification of the dihalogenoalkane shown? Cl Cl (1) A primary B secondary C tertiary D primary and secondary
- November 2021, Paper 2, Q10(d)(ii) (4 marks): Complete the diagram to show the mechanism for Reaction 4. Include curly arrows, and relevant lone pairs and dipoles. (4) H H C H2 H2 Br CH3 H C C H3C C N H2 H
- November 2021, AS Paper 2, Q6(b) (1 mark): What is the classification of the mechanism for the hydrolysis of 2‑chloro‑2‑methylpropane by water? (1) A addition B elimination C free radical substitution D
- November 2021, AS Paper 2, Q6(c)(i) (2 marks): State the visible change in the reaction of an ethanol/silver nitrate solution with halogenoalkane X. Include the formula of the compound responsible for this o
- November 2021, AS Paper 2, Q6(c)(ii) (1 mark): The three halogenoalkanes were placed in order of decreasing rate of reaction. Which is the correct sequence? (1) A X, Z, Y B Z, X, Y C Z, Y, X D X, Y, Z
- November 2021, AS Paper 2, Q6(d)(i) (2 marks): State the reagent and conditions needed for this reaction. (2)
- October 2020, Paper 2, Q6(a) (1 mark): This experiment is carried out using the bromoalkane dissolved in ethanol and the hydroxide ions dissolved in water. Give a reason why a solution of hydroxide
- October 2020, AS Paper 2, Q2(c) (1 mark): 2‑methylpropan‑2‑ol may be formed by the reaction between 2‑bromo‑2‑methylpropane and aqueous potassium hydroxide. What is the role of the hydroxide ions in thi
- October 2020, AS Paper 2, Q7(a)(i) (1 mark): State the purpose of adding ethanol to each of the test tubes. (1)
- October 2020, AS Paper 2, Q7(a)(ii) (1 mark): Give one reason why the test tubes were put in the same beaker of hot water. (1)
- October 2020, AS Paper 2, Q7(a)(iii) (1 mark): Give one reason why the test tubes were shaken after the addition of aqueous silver nitrate. (1)
- October 2020, AS Paper 2, Q7(b)(i) (1 mark): State how the halogen atom present in each halogenoalkane can be identified using observations from this experiment in (a). (1)
- October 2020, AS Paper 2, Q7(c) (6 marks): Outline the method for a test tube experiment, which expands on the steps in (a), to investigate how the rate of the substitution reaction depends on whether th
- June 2019, Paper 2, Q8(a)(ii) (4 marks): Draw the mechanism for the reaction in Step 1. Include curly arrows, and relevant lone pairs and dipoles. (4)
- June 2019, AS Paper 2, Q2(c)(i) (1 mark): Under appropriate conditions, 1-chloropropane can be converted into butanenitrile, CH3CH2CH2CN. Which is the reagent for this conversion? (1) A ammonia B nitric
- June 2019, AS Paper 2, Q5(a) (1 mark): State the purpose of the condenser. (1)
- June 2019, AS Paper 2, Q5(e)(i) (1 mark): Another compound formed from 1-bromobutane under these conditions is butan-1-ol. Identify the type of reaction taking place to form butan-1-ol. (1)
- June 2019, AS Paper 2, Q5(e)(iii) (3 marks): Draw the mechanism for the reaction of 1-bromobutane with hydroxide ions to form butan-1-ol. Include curly arrows, and any appropriate lone pairs and dipoles. (
- June 2019, AS Paper 2, Q5(f) (1 mark): Alkene molecules are formed by elimination from 2-bromobutane. How many isomeric alkene products will be formed in this reaction? (1) A 1 B 2 C 3 D 4
- June 2018, Paper 2, Q6(a) (5 marks): Devise an experiment, giving outline details only, that would enable the relative rates of hydrolysis of halogenoalkanes to be compared. (5)
- June 2018, Paper 2, Q6(b) (2 marks): Explain the trend in the rates of hydrolysis of 1-chlorobutane, 1-bromobutane and 1-iodobutane. (2)
- June 2018, AS Paper 2, Q1 (1 mark): Which of the following does not act as a nucleophile? A HBr B H2O C NH3 D CN−
- June 2018, AS Paper 2, Q4(a)(i) (2 marks): State the reagent and conditions used in Reaction 1. (2)
- June 2018, AS Paper 2, Q4(a)(ii) (2 marks): Identify a suitable reagent for Reaction 2 and include a reason why this is a particularly useful type of reaction in organic chemistry. (2) Reagent Reason
- June 2018, AS Paper 2, Q4(a)(iii) (2 marks): Explain why, in Reaction 3, the reactants are heated in a sealed container. (2)
- June 2018, AS Paper 2, Q4(a)(iv) (1 mark): Write the structural formula of the product that will be formed if 1-chloropropane is refluxed with aqueous potassium hydroxide solution. (1)
- June 2018, AS Paper 2, Q4(b) (1 mark): The bromoalkanes, X, Y and Z, were each added to a mixture of aqueous silver nitrate and ethanol at 50 °C. The rate of hydrolysis was compared by measuring the
- June 2017, Paper 2, Q3(a) (2 marks): Explain the trend in reactivity of the primary chloro-, bromo- and iodoalkanes with aqueous hydroxide ions. (2)
- June 2017, Paper 2, Q3(b)(i) (4 marks): Write the mechanism for this reaction, including all relevant curly arrows, lone pairs and dipoles. Include the transition state. (4)
- June 2017, Paper 2, Q3(c) (3 marks): The halogenoalkane 2-bromobutane reacts with ethanolic potassium hydroxide to produce a mixture of alkenes. Draw the skeletal formulae of all the alkenes that c
- June 2017, Paper 3, Q8(a) (3 marks): Draw the mechanism for the reaction of CH3CH2CH2Cl with an excess of ammonia to form the primary amine. Include curly arrows and relevant lone pairs. (3)
- June 2017, AS Paper 2, Q7(a)(i) (1 mark): The time taken for a precipitate to appear increases in the order (1) A X, Y, Z B Z, Y, X C Y, X, Z D Z, X, Y
- June 2017, AS Paper 2, Q7(a)(ii) (1 mark): Give a reason for the addition of ethanol to each test tube. (1)
- June 2017, AS Paper 2, Q7(a)(iii) (1 mark): Give a reason why the test tubes were left in the water bath for five minutes before adding the halogenoalkanes. (1)
- June 2017, AS Paper 2, Q7(a)(iv) (2 marks): The precipitates form as a result of reactions between aqueous silver ions and aqueous halide ions. Explain why halide ions are present in the mixture containin
- June 2017, AS Paper 2, Q7(a)(v) (1 mark): Write the ionic equation, including state symbols, for the reaction involving the silver nitrate in test tube X. (1)
- June 2017, AS Paper 2, Q7(c)(i) (1 mark): Which term best describes the role of the OH– ion in the reaction in (b)? (1) A catalyst B electrophile C free radical D nucleophile
- June 2017, AS Paper 2, Q7(c)(ii) (4 marks): Draw a diagram to show the mechanism for the hydrolysis of 1-bromo-2-methylpropane by the hydroxide ion. Include any appropriate lone pairs and dipoles. (4)
- June 2017, AS Paper 2, Q7(c)(iii) (1 mark): The hydrolysis reaction described in part (b) may also be classified as (1) A addition B elimination C redox D substitution
- June 2016, AS Paper 2, Q3(a)(i) (1 mark): Write the ionic equation for the hydrolysis of 2-bromobutane showing the structural formulae for the organic molecules. (1)
- June 2016, AS Paper 2, Q3(a)(ii) (6 marks): Devise an experiment to compare the rates of hydrolysis of 2-chlorobutane, 2-bromobutane and 2-iodobutane. State the trend in the rates of reaction. Justify you
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