Lesson 4.2.2

4.2.2 Haloalkanes Quiz: OCR Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.2, Haloalkanes: 20 multiple choice questions for the OCR Chemistry (H432), Unit 3: Core organic chemistry, written with Revision Ninja.

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The 20 questions

  1. What is the organic product of heating 1-bromobutane with aqueous alkali?

    • 1-iodobutane
    • Butanal
    • Butene
    • Butan-1-ol

  2. How is a nucleophile defined in organic chemistry mechanisms?

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

  3. Which species acts as the nucleophile in the hydrolysis of a haloalkane with aqueous alkali?

    • Na+ ions
    • OH- ions
    • H+ ions
    • Br- ions

  4. What mechanism occurs when a primary haloalkane reacts with aqueous hydroxide ions?

    • Electrophilic addition
    • Nucleophilic substitution
    • Nucleophilic addition
    • Electrophilic substitution

  5. Which carbon-halogen bond is broken most readily in hydrolysis?

    • C-Br
    • C-Cl
    • C-F
    • C-I

  6. Why is fluoroethane extremely resistant to hydrolysis compared to chloroethane?

    • Non-polar bond
    • High bond enthalpy
    • High ionic character
    • Low bond enthalpy

  7. Which reagent is used alongside ethanol to compare haloalkane hydrolysis rates?

    • Aqueous silver nitrate
    • Aqueous sodium carbonate
    • Bromine water
    • Acidified potassium dichromate

  8. What species is produced when UV radiation breaks down CFCs in the stratosphere?

    • Chlorine radicals
    • Fluorine radicals
    • Chlorine molecules
    • Chloride ions

  9. Which equation shows a chlorine radical reacting with ozone?

    • Cl• + O3 → Cl- + O3+
    • Cl• + O3 → ClO• + O2
    • Cl• + O2 → ClO3•
    • Cl• + O3 → Cl2 + O2

  10. Which equation regenerates the chlorine radical in ozone depletion?

    • ClO• + O → Cl- + O2+
    • ClO• + O2 → Cl• + O3
    • ClO• + O → Cl• + O2
    • ClO• + O → Cl2 + O2

  11. Which property made CFCs useful as refrigerants and aerosol propellants?

    • Flammability
    • High solubility
    • High reactivity
    • Chemical inertness

  12. How many mol of Cl radicals are formed from 1 mol of CF2Cl2?

    • 1 mol
    • 0.5 mol
    • 2 mol
    • 4 mol

  13. Why is ethanol added when testing haloalkane hydrolysis rates with aqueous silver nitrate?

    • Precipitate silver
    • Neutralise acid
    • To dissolve haloalkanes
    • Act as catalyst

  14. What type of reaction is the hydrolysis of a haloalkane?

    • Electrophilic addition
    • Radical substitution
    • Oxidation
    • Nucleophilic substitution

  15. Why can a single chlorine radical destroy thousands of ozone molecules?

    • Acts as nucleophile
    • It is consumed
    • Absorbs UV radiation
    • It is regenerated

  16. Which other radical is known to catalyse the breakdown of ozone, besides Cl•?

    • CO2
    • O2
    • H2O
    • NO•

  17. Which carbon-halogen bond has the lowest bond enthalpy value?

    • C-Cl
    • C-I
    • C-F
    • C-Br

  18. What is the organic product of hydrolysing 2-chloropropane with aqueous alkali?

    • Propanone
    • Propene
    • Propan-2-ol
    • Propan-1-ol

  19. Why does 1-bromobutane undergo hydrolysis faster than 1-chlorobutane?

    • Higher bond enthalpy
    • Lower molecular mass
    • Greater bond polarity
    • Lower bond enthalpy

  20. What is the organic product of heating 1-iodopropane with aqueous sodium hydroxide?

    • Propene
    • 1-chloropropane
    • Propan-1-ol
    • Propanal

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