Lesson 3.3.1.3

3.3.1.3 Isomerism Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.1.3, Isomerism: 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 are structural isomers?

    • Compounds with the same structure but different molecular formulas
    • Compounds that differ only in the arrangement of atoms in space
    • Compounds with the same molecular formula but different structural arrangement of atoms
    • Compounds with identical boiling points and formulas

  2. What are stereoisomers?

    • Compounds that are always ionic
    • Compounds with different molecular formulas
    • Compounds with different functional groups
    • Compounds with the same structural formula but different arrangements of atoms in space

  3. What is the cause of E-Z isomerism?

    • Restricted rotation about a planar carbon-carbon double bond
    • The presence of an ionic bond
    • Different molecular formulas
    • Free rotation about a single carbon-carbon bond

  4. Which of these is an example of position isomers of C3H7OH?

    • Propan-1-ol and methoxyethane
    • Propan-1-ol and propanoic acid
    • Propan-1-ol and propan-2-ol
    • Propan-1-ol and propanone

  5. Which pair are functional group isomers?

    • Butane and 2-methylpropane
    • Ethanol and methoxymethane
    • Propan-1-ol and propan-2-ol
    • But-1-ene and but-2-ene

  6. Which pair are chain isomers?

    • Propan-1-ol and propan-2-ol
    • Ethanol and methoxymethane
    • But-1-ene and but-2-ene
    • Butane and 2-methylpropane

  7. How many structural isomers does C4H10 have?

    • 1
    • 4
    • 3
    • 2

  8. How many structural isomers does C5H12 have?

    • 4
    • 2
    • 3
    • 5

  9. Which of these is an E isomer?

    • A structure with no double bond
    • A structure with a chiral centre only
    • A structure where the higher-priority groups are on the same side
    • A structure where the higher-priority groups on each C=C carbon are on opposite sides

  10. Which compound shows E-Z isomerism?

    • Propene
    • But-1-ene
    • Ethane
    • But-2-ene

  11. Which compound does NOT show E-Z isomerism?

    • Pent-2-ene
    • But-1-ene
    • But-2-ene
    • Hex-3-ene

  12. Which group has the higher priority in CIP rules when comparing -Cl and -CH3 on the same carbon?

    • -CH3
    • -Cl
    • Neither has priority
    • They have equal priority

  13. Which group has higher CIP priority: -CH2CH3 or -CH3?

    • -CH2CH3
    • They have equal priority
    • Neither has priority
    • -CH3

  14. Which feature of an alkene means it can show E-Z isomerism?

    • Two different groups attached to each carbon of the C=C double bond
    • Only one hydrogen on each carbon of the double bond
    • The presence of a benzene ring
    • A triple bond between two carbon atoms

  15. What is a stereoisomer that is a non-superimposable mirror image of another molecule called?

    • A functional group isomer
    • An optical isomer
    • A positional isomer
    • A chain isomer

  16. What is the formula of an isomer of CH3CH2OH that is an ether?

    • CH2=CH2
    • CH3COOH
    • CH3OCH3
    • CH3CHO

  17. Which set of compounds has the same molecular formula?

    • Methane and propane
    • Ethene and ethane
    • Ethanol and ethanoic acid
    • Ethanol and methoxymethane

  18. Which alkene can exist as E and Z isomers?

    • CH2=CH2
    • CH3CH=CHCH2CH3
    • (CH3)2C=CH2
    • CH2=CHCH2CH3

  19. Explain why but-2-ene shows E-Z isomerism but propene does not.

    • Each carbon of the C=C in but-2-ene carries two different groups, while propene has two hydrogens on one carbon
    • Propene has a longer chain than but-2-ene
    • But-2-ene has an extra oxygen atom
    • Propene is always a Z isomer

  20. A student draws two structures of C4H8 that differ only in the arrangement of groups around the C=C bond. What is the relationship between them?

    • They are E and Z stereoisomers
    • They are functional group isomers
    • They are chain isomers
    • They are identical compounds

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