Lesson 6A.2

6A.2 Reaction types and isomerism Quiz: Pearson Edexcel Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6A.2, Reaction types and isomerism: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 6: Organic Chemistry I, written with Revision Ninja.

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The 20 questions

  1. Ethene reacts with bromine to form 1,2-dibromoethane. How is this reaction classified?

    • Substitution
    • Hydrolysis
    • Addition
    • Elimination

  2. Ethanol is converted into ethene and water when heated with concentrated phosphoric acid. What type of reaction is this?

    • Polymerisation
    • Oxidation
    • Addition
    • Elimination

  3. What reaction type converts bromoethane to ethanol using aqueous sodium hydroxide?

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

  4. What reaction type converts ethanol to ethanal using acidified potassium dichromate(VI)?

    • Hydration
    • Oxidation
    • Esterification
    • Reduction

  5. Which molecular formula corresponds to two possible structural isomers, butane and 2-methylpropane?

    • C5H12
    • C4H10
    • C4H8
    • C3H8

  6. How many structural isomers are there for the molecular formula C5H12?

    • 4
    • 5
    • 3
    • 2

  7. Which compound shows E/Z isomerism?

    • 2-methylpropene, (CH3)2C=CH2
    • But-2-ene, CH3CH=CHCH3
    • Ethene, CH2=CH2
    • Propene, CH2=CHCH3

  8. Which compound shows cis-trans isomerism where two of the substituent groups are the same?

    • 1,2-dichloroethene, ClCH=CHCl
    • 2-chloropropene, CH2=CClCH3
    • Chloroethene, CH2=CHCl
    • 1,1-dichloroethene, Cl2C=CH2

  9. Which pair of compounds are structural isomers?

    • Butan-1-ol and butan-2-ol
    • Propan-1-ol and propanal
    • Ethanol and ethane
    • Chloromethane and methane

  10. How many distinct alkenes have the molecular formula C4H8, counting E and Z forms separately?

    • 5
    • 2
    • 3
    • 4

  11. Which type of reaction converts ethene into poly(ethene)?

    • Addition polymerisation
    • Condensation polymerisation
    • Electrophilic addition
    • Free radical substitution

  12. What type of isomerism involves the same structural formula but a different spatial arrangement?

    • Stereoisomerism
    • Functional group isomerism
    • Chain isomerism
    • Structural isomerism

  13. Which reaction type is the conversion of propan-2-ol into propanone?

    • Oxidation
    • Elimination
    • Polymerisation
    • Reduction

  14. Which reaction converts an alkene into an alkane using a nickel catalyst?

    • Hydration
    • Hydrohalogenation
    • Hydrogenation
    • Halogenation

  15. Isomers with identical structural formulas but different 3D spatial arrangements are called what?

    • Stereoisomers
    • Position isomers
    • Chain isomers
    • Structural isomers

  16. Which reaction type describes the reaction of 1-chloropropane with aqueous potassium hydroxide to form propan-1-ol?

    • Electrophilic addition
    • Radical addition
    • Nucleophilic substitution
    • Oxidation

  17. Which compound would be formed by the hydration of ethene?

    • Ethanol
    • Ethane-1,2-diol
    • Ethanoic acid
    • Ethanal

  18. What reaction type is involved when hydrogen chloride adds across the double bond of propene?

    • Substitution
    • Addition
    • Condensation
    • Elimination

  19. Propanal and propanone are examples of which type of isomer?

    • Chain isomers
    • Functional group isomers
    • Position isomers
    • Stereoisomers

  20. Which compound is the product of the oxidation of ethanol by [O] under reflux with excess oxidising agent?

    • Ethanoic acid
    • Ethanal
    • Ethane
    • Ethyl ethanoate

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