Lesson 3.3.4.2

3.3.4.2 Addition reactions of alkenes Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.4.2, Addition reactions of alkenes: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.

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The 20 questions

  1. What type of mechanism do alkenes undergo with HBr?

    • Elimination
    • Nucleophilic substitution
    • Electrophilic addition
    • Free-radical substitution

  2. Which species is initially attacked by the double bond in electrophilic addition of HBr?

    • Hydrogen atom
    • Hydride ion
    • Bromide ion
    • Carbon atom

  3. What is the product of the reaction of ethene with bromine water?

    • 1,2-dibromoethane
    • Tribromoethane
    • Bromoethene
    • Ethanol

  4. Which reagent is used to test for unsaturation in an organic compound?

    • Lime water
    • Sodium carbonate
    • Bromine water
    • Dilute hydrochloric acid

  5. What is the major product of adding HBr to propene?

    • 2-bromopropane
    • Bromoethane
    • 1-bromopropane
    • Propan-2-ol

  6. What is the minor product of adding HBr to propene?

    • Propene only
    • 1-bromopropane
    • 2-bromopropane
    • Bromoethane

  7. Which carbocation is the most stable?

    • Secondary only
    • Tertiary
    • Primary
    • Methyl only

  8. Why is 2-bromopropane the major product when HBr reacts with propene?

    • Faster bromide attack
    • Less stable carbocation
    • Lower activation energy
    • More stable carbocation

  9. Which alkene gives only one product when reacted with HBr?

    • Ethene
    • But-1-ene
    • 2-methylpropene
    • Propene

  10. What is the product of adding H2SO4 to ethene followed by hydrolysis?

    • Ethanol
    • Ethyne
    • Ethanoic acid
    • Ethane

  11. What happens to a neutral bromine molecule as it approaches an alkene?

    • Becomes polarised
    • Becomes radicalised
    • Remains non-polar
    • Ionises completely

  12. What role does the alkene play in electrophilic addition reactions?

    • Electron pair acceptor
    • Free radical
    • Proton donor
    • Electron pair donor

  13. Which product forms when HBr adds to but-1-ene in the major pathway?

    • Butan-1-ol
    • 1-bromobutane
    • 2-bromobutane
    • But-2-ene

  14. What is the name of the rule used to predict the major product of electrophilic addition to unsymmetrical alkenes?

    • Avogadro's law
    • Markovnikov's rule
    • Le Chatelier's principle
    • Hess's law

  15. What role does concentrated sulfuric acid play in its initial attack on an alkene?

    • Electrophile
    • Catalyst
    • Free radical
    • Nucleophile

  16. What is the balanced equation for the addition of Br2 to ethene?

    • C2H4 + Br2 -> C2H4Br2
    • C2H4 + Br2 -> C2H2Br2 + H2
    • C2H4 + 2Br2 -> C2H4Br4
    • C2H4 + Br2 -> C2H3Br + HBr

  17. Which factor determines the major product in electrophilic addition to an unsymmetrical alkene?

    • Solvent polarity
    • Carbocation stability
    • Steric hindrance
    • Bond enthalpy

  18. What inductive effect makes tertiary carbocations more stable than primary carbocations?

    • Electron withdrawing
    • Proton donating
    • Electron donating
    • Neutron sharing

  19. What type of hydrocarbon decolourises bromine water in the test for unsaturation?

    • Cycloalkane
    • Arene
    • Alkane
    • Alkene

  20. What colour change occurs when bromine water reacts with an alkene?

    • Colourless to orange
    • Orange to brown
    • Orange to colourless
    • Brown to purple

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