Halogenoalkanes: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.3.3 Halogenoalkanes, 2016–2025, with its mark scheme and examiner’s report.

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Q01.4
June 2025 · Paper 2
2 marks3.3.3 Halogenoalkanes
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Q01.6
June 2025 · Paper 2
1 mark3.3.3 Halogenoalkanes
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Q09.5
June 2025 · Paper 2
1 mark3.3.3 Halogenoalkanes 3.1.9 Rate equations
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Q09.6
June 2025 · Paper 2
2 marks3.3.3 Halogenoalkanes
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Q08
June 2025 · Paper 3
1 mark3.3.3 Halogenoalkanes
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Q10
June 2025 · Paper 3
1 mark3.3.3 Halogenoalkanes
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Q01.1
June 2025 · AS Paper 2
2 marks3.3.3 Halogenoalkanes
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Q01.2
June 2025 · AS Paper 2
3 marks3.3.3 Halogenoalkanes
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Q01.3
June 2025 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
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Q01.4
June 2025 · AS Paper 2
5 marks3.3.3 Halogenoalkanes
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Q15
June 2025 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
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Q05.1
June 2024 · Paper 2
2 marks3.3.9 Carboxylic acids and derivatives 3.3.3 Halogenoalkanes
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Q08.2
June 2024 · Paper 2
2 marks3.3.3 Halogenoalkanes
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Q03.3
June 2024 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
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Q03.4
June 2024 · AS Paper 2
2 marks3.3.3 Halogenoalkanes
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Q03.5
June 2024 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
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Q06.1
June 2024 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
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Q06.3
June 2024 · AS Paper 2
3 marks3.3.3 Halogenoalkanes
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Q07.4
June 2024 · AS Paper 2
3 marks3.3.3 Halogenoalkanes
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Q07.5
June 2024 · AS Paper 2
1 mark3.3.3 Halogenoalkanes
The whole paper ↗

All 81 questions on Halogenoalkanes, as a list

June 2025, Paper 2, Q01.4 (2 marks): Give a suitable reagent and conditions needed for reaction 2. [2 marks] Reagent Conditions
June 2025, Paper 2, Q01.6 (1 mark): Use of the reagent for reaction 2 followed by the reagent for reaction 3 gives another organic product. Give the structure of the other organic product. [1 mark
June 2025, Paper 2, Q09.5 (1 mark): The rate equation for the reaction between a different bromoalkane (R2CHBr) and an aqueous solution of KOH is rate = k [R2CHBr] Which of these is a correct mech
June 2025, Paper 2, Q09.6 (2 marks): Explain, in terms of bond polarity, why R2CHBr and KOH react together. [2 marks]
June 2025, Paper 3, Q08 (1 mark): Each of the conversions shown uses KOH as a reactant. In which conversion does KOH not act as a base? [1 mark] A (CH3)2NH2+Br – to (CH3)2NH B CH3COOH to CH3COO–
June 2025, Paper 3, Q10 (1 mark): Which diagram shows a correct step in the mechanism for an elimination reaction of bromoethane? [1 mark] A B C D
June 2025, AS Paper 2, Q01.1 (2 marks): Halogenoalkanes undergo substitution reactions with nucleophiles such as CN–, NH3 and OH– Explain why halogenoalkanes react with nucleophiles. [2 marks]
June 2025, AS Paper 2, Q01.2 (3 marks): 2-Bromobutane reacts with ammonia to form CH3CH(NH2)CH2CH3 Complete the mechanism for this reaction. [3 marks] 2-Bromobutane reacts with KOH to give a mixture o
June 2025, AS Paper 2, Q01.3 (1 mark): Identify the solvent that should be used to ensure that butan-2-ol is the main organic product when 2-brombutane reacts with KOH [1 mark]
June 2025, AS Paper 2, Q01.4 (5 marks): Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene and two other alkenes. Name and complete the mechanism to form but-1-ene from 2-brom
June 2025, AS Paper 2, Q15 (1 mark): Which equation shows a step in the decomposition of ozone by free radicals formed from CFCs in the upper atmosphere? [1 mark] A Cl● + O3 → O2 + ClO● B Cl● + O3
June 2024, Paper 2, Q05.1 (2 marks): Silver nitrate solution can be used to distinguish between propanoyl chloride and 1-chloropropane. Give the observations you would expect when a few drops of si
June 2024, Paper 2, Q08.2 (2 marks): Identify compound J. State the reagent(s) and conditions needed for Step 2. [2 marks] Compound J Reagent(s) and conditions
June 2024, AS Paper 2, Q03.3 (1 mark): In the presence of ultraviolet radiation, CFCl3 breaks down in the upper atmosphere to form chlorine free radicals. Give an equation for this reaction. [1 mark]
June 2024, AS Paper 2, Q03.4 (2 marks): Chlorine free radicals catalyse the decomposition of ozone. Give two equations to show how chlorine free radicals decompose ozone. [2 marks] Equation 1 Equation
June 2024, AS Paper 2, Q03.5 (1 mark): The production and use of CFCs have been banned in many countries because they decrease the amount of ozone in the upper atmosphere. State why ozone in the uppe
June 2024, AS Paper 2, Q06.1 (1 mark): Identify the yellow precipitate formed in the reaction. [1 mark]
June 2024, AS Paper 2, Q06.3 (3 marks): The student repeats the investigation using 1-bromobutane instead of 1-iodobutane. State and explain how the rate of reaction for 1-bromobutane compares with th
June 2024, AS Paper 2, Q07.4 (3 marks): Name and outline the mechanism for Step 1. [3 marks] Name of mechanism Outline of mechanism
June 2024, AS Paper 2, Q07.5 (1 mark): Suggest one reason why water is not a suitable solvent for Step 1. [1 mark]
June 2024, AS Paper 2, Q11 (1 mark): Which labelled curly arrow shows an incorrect movement of an electron pair? [1 mark] A B C D
June 2024, AS Paper 2, Q12 (1 mark): A halogenoalkane reacts with ethanolic potassium hydroxide to form these alkenes by elimination: • 2-ethylpent-1-ene • E-3-methylhex-2-ene • Z-3-methylhex-2-ene
June 2023, Paper 2, Q04.3 (2 marks): Identify the reagent that is warmed with isomer W in reaction 2. State the other reaction condition needed. [2 marks] Reagent Condition
June 2023, Paper 3, Q29 (1 mark): Which is not a possible product of a reaction between KOH and ? [1 mark] A B C D
June 2023, Paper 3, Q30 (1 mark): Most scientists believe that the concentration of ozone in the upper atmosphere should not be allowed to decrease. Which statement is a correct reason for this
June 2023, AS Paper 2, Q03.1 (2 marks): Outline the mechanism for the nucleophilic substitution reaction of 1-bromobutane with sodium hydroxide. [2 marks]
June 2023, AS Paper 2, Q03.2 (2 marks): State how Figure 1 shows that the rate of reaction of 1-iodobutane is faster than the rate of reaction of 1-bromobutane. State why the rates are different. [2 m
June 2023, AS Paper 2, Q12 (1 mark): Most scientists believe that ozone in the upper atmosphere should not be allowed to become depleted. Which is a valid reason for this belief? [1 mark] A Ozone a
June 2023, AS Paper 2, Q13 (1 mark): Which is not a possible product of the reaction of this compound with potassium hydroxide? [1 mark] A B C D
June 2022, Paper 2, Q02.5 (2 marks): Chemists provided evidence that was used to support a ban on the use of chlorodifluoromethane as a refrigerant. Many refrigerators now use pentane as a refriger
June 2022, Paper 3, Q03.1 (2 marks): Give the names of the two concurrent mechanisms responsible for the formation of the alkenes and the alcohols. [2 marks] Mechanism to form alkenes Mechanism to
June 2022, Paper 3, Q03.4 (3 marks): Outline the mechanism for the reaction of 2-bromobutane with sodium hydroxide to form alkene A. [3 marks]
June 2022, Paper 3, Q03.7 (2 marks): A student compares the rates of hydrolysis of 1-chlorobutane, 1-bromobutane and 1-iodobutane. The suggested method is: • add equal volumes of the three halogeno
June 2022, Paper 3, Q23 (1 mark): Which compound is formed from bromoethane in a nucleophilic substitution reaction? [1 mark] A CH3CN B CH3CH2NH2 C CH2=CH2 D CH3CH2OSO2OH
June 2022, AS Paper 2, Q05.1 (5 marks): Name and outline the mechanism for this reaction. [5 marks] Name of mechanism Outline of mechanism
June 2022, AS Paper 2, Q16 (1 mark): Which reaction does not result in a change in the shape around a carbon atom? [1 mark] A chloromethane with aqueous sodium hydroxide B ethene with bromine C pro
June 2022, AS Paper 2, Q21 (1 mark): Which of these compounds is not produced? [1 mark] A butan-1-ol B butan-2-ol C but-1-ene D E-but-2-ene
June 2022, AS Paper 2, Q22 (1 mark): What is the role of the hydroxide ions in the elimination reaction? [1 mark] A base B catalyst C electrophile D nucleophile
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, Paper 2, Q09.1 (1 mark): State why the ozone layer is beneficial for living organisms. [1 mark]
November 2021, Paper 2, Q09.2 (1 mark): State how chlorofluorocarbons (CFCs) form chlorine atoms in the upper atmosphere. [1 mark]
November 2021, Paper 2, Q09.3 (2 marks): Give equations to show how chlorine atoms catalyse the decomposition of ozone. [2 marks]
November 2021, AS Paper 2, Q04.2 (1 mark): A molecule of CFC-11 breaks down in the upper atmosphere to form a chlorine free radical. Give the equation for this reaction. [1 mark]
November 2021, AS Paper 2, Q04.4 (1 mark): State the benefit to life on Earth of ozone in the upper atmosphere. [1 mark]
November 2021, AS Paper 2, Q04.5 (1 mark): Suggest one reason why the use of CFCs was not restricted until several years after Rowland and Molina published their research. [1 mark]
November 2021, AS Paper 2, Q07.1 (1 mark): Prop-2-en-1-ol can be prepared by reacting 3-chloroprop-1-ene with dilute aqueous sodium hydroxide. Name the mechanism for this reaction. [1 mark]
November 2021, AS Paper 2, Q13 (1 mark): Which compound is not formed by reacting 3-bromo-3-methylhexane with warm, ethanolic potassium hydroxide? [1 mark] A 2-ethylpent-1-ene B 3-methylhex-1-ene C 3-m
November 2021, AS Paper 2, Q14 (1 mark): What is the organic product of this reaction? [1 mark] A propylamine B butylamine C propanenitrile D butanenitrile
November 2021, AS Paper 2, Q15 (1 mark): Which is the correct mechanism for the reaction? [1 mark] A B C D
November 2021, AS Paper 2, Q16 (1 mark): The reactions of 1-bromopropane and 1-chloropropane with potassium cyanide in aqueous ethanol occur at different rates under the same conditions. Which row corr
November 2020, Paper 2, Q05.2 (4 marks): Outline the mechanism for the reaction of 2-bromopropane with an excess of ammonia. [4 marks]
November 2020, AS Paper 2, Q01.5 (5 marks): Ammonia reacts with 1-chloropropane to form propylamine. Name and outline the mechanism for this reaction. [5 marks] Name of mechanism Outline of mechanism
November 2020, AS Paper 2, Q10 (1 mark): Which statement is not correct about ozone? [1 mark] A It absorbs harmful ultraviolet radiation in the upper atmosphere. B It decomposes to form oxygen. C Its d
June 2019, AS Paper 2, Q02.1 (2 marks): Outline the mechanism for this reaction. [2 marks]
June 2019, AS Paper 2, Q02.2 (1 mark): Give the IUPAC name of D. [1 mark]
June 2019, AS Paper 2, Q09.1 (1 mark): Molecules of 1,2-dichlorotetrafluoroethane can break down in the upper atmosphere to form chlorine radicals. Give an equation to show the breakdown of one molec
June 2019, AS Paper 2, Q09.2 (2 marks): Give two equations to show how chlorine radicals catalyse the decomposition of ozone. [2 marks]
June 2019, AS Paper 2, Q16 (1 mark): Which compound can react with ammonia to produce propylamine? [1 mark] A CH3CH═CH2 B CH3CH2CH2OH C CH3CH2CH2Br D CH3CH2CH3
June 2019, AS Paper 2, Q19 (1 mark): Which species can act as a nucleophile? [1 mark] A NH4 + B CH3OH C CH4 D H+
June 2019, AS Paper 2, Q22 (1 mark): Which compound could not be produced by reacting 2-bromo-3-methylbutane with sodium hydroxide? [1 mark] A 2-methylbut-1-ene B 3-methylbut-1-ene C 2-methylbut-2-
June 2018, Paper 2, Q01.4 (4 marks): Chlorofluorocarbons (CFCs) are a group of halogenoalkanes currently banned in many countries. They cannot be used as solvents or refrigerants because of their e
June 2018, Paper 2, Q02.2 (3 marks): Reaction 1 occurs via a nucleophilic substitution mechanism. Explain why the halogenoalkane is attacked by the nucleophile in this reaction. [3 marks]
June 2018, Paper 3, Q10 (1 mark): Which statement is correct about the molecule shown? [1 mark] A It reacts with HBr in an electrophilic substitution reaction. B It reacts with NaBH4 in a nucleo
June 2018, AS Paper 2, Q06.3 (4 marks): Reaction of A with warm, dilute aqueous sodium hydroxide forms alcohol B. Name the mechanism for this reaction. Outline the mechanism using the structure of A s
June 2018, AS Paper 2, Q06.4 (6 marks): Reaction of A with hot, ethanolic potassium hydroxide gives alkene C. Name the mechanism for this reaction. State the role of the hydroxide ions. Outline the me
June 2018, AS Paper 2, Q06.6 (1 mark): Compound D reacts with dilute aqueous sodium hydroxide in a similar way to A to form alcohol B. Compound A Compound D Explain why D reacts more quickly than A w
June 2018, AS Paper 2, Q18 (1 mark): Which species could act as a nucleophile? [1 mark] A BH3 B NH4 + C PH3 D SiH4
June 2017, Paper 2, Q01.1 (1 mark): Draw the displayed formula of compound J. [1 mark
June 2017, Paper 2, Q01.2 (2 marks): Name the mechanism for Reaction 2 and give an essential condition used to ensure that CH3CH2CH2NH2 is the major product. [2 marks Name of mechanism Condition
June 2017, Paper 2, Q01.5 (1 mark): Identify the reagent and conditions used in Reaction 3. [1 mark
June 2017, Paper 2, Q01.6 (4 marks): Name and outline a mechanism for Reaction 3. [4 marks Name of mechanism Mechanism
June 2017, Paper 3, Q14 (1 mark): The reaction sequence shows how CH3CH3 can be converted into BrCH2CH2Br Which step occurs by nucleophilic substitution? [1 mark] A Step A B Step B C Step C D St
June 2017, AS Paper 2, Q06.1 (3 marks): Name and outline the mechanism for this reaction. [3 marks] Name of mechanism Mechanism
June 2017, AS Paper 2, Q06.3 (2 marks): When 1-bromo-2-methylpropane reacts with hot, concentrated ethanolic potassium hydroxide rather than dilute aqueous sodium hydroxide, a different product is for
June 2017, AS Paper 2, Q16 (1 mark): Which compound has the fastest rate of reaction with potassium cyanide to form pentanenitrile? [1 mark] A 1-bromobutane B 1-chlorobutane C 1-fluorobutane D 1-io
June 2016, AS Paper 2, Q05.1 (2 marks): Write two equations to show how chlorine radicals react with ozone molecules in the upper atmosphere. [2 marks] 1 2
June 2016, AS Paper 2, Q05.2 (1 mark): Chloropentafluoroethane is a CFC that has been used as a refrigerant. Draw its displayed formula. [1 mark]
June 2016, AS Paper 2, Q05.3 (1 mark): 1,1,1-trifluoroethane (CF3CH3) is one of the molecules that has been used as a refrigerant in place of CFCs. Explain why 1,1,1-trifluoroethane does not lead to
June 2016, AS Paper 2, Q10 (1 mark): Pentanenitrile can be made by reaction of 1-bromobutane with potassium cyanide. Which of these is the correct name for the mechanism of this reaction? [1 mark]
June 2016, AS Paper 2, Q13 (1 mark): Which of the following is a correct mechanism for the formation of 2-methylbut-2-ene from 2-bromo-3-methylbutane? [1 mark] A B C D
Specimen, Paper 3, Q28 (1 mark): Why are fluoroalkanes unreactive? [1 mark] A Fluorine is highly electronegative. B The F– ion is very stable. C They are polar molecules. D The C F bond is very

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