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 property must be identical in all structural isomers of a compound?

    • Structural formula
    • Boiling point
    • Molecular formula
    • Functional group

  2. Which term describes molecules with the same structural formula but a different spatial arrangement of atoms?

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

  3. What main feature causes E-Z isomerism to occur in alkene molecules?

    • Restricted C=C rotation
    • Hydrogen bonding
    • Variable chain length
    • Free C-C rotation

  4. Which pair of molecules represents position isomers of each other?

    • Propane and propene
    • Ethanol and methoxymethane
    • Propan-1-ol and propan-2-ol
    • Propanal 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. In an E isomer, where are the highest priority groups relative to the double bond?

    • Adjacent carbons
    • Terminal positions
    • Same side
    • 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 Cahn-Ingold-Prelog priority when attached to a C=C bond?

    • -CH3
    • -Cl
    • -H
    • -CH2CH3

  13. Which group has the higher Cahn-Ingold-Prelog priority when comparing -CH3 and -CH2CH3?

    • -CH2CH3
    • -H
    • Both are equal
    • -CH3

  14. What structural feature is required on each C=C carbon for E-Z isomerism?

    • Two different groups
    • Two identical groups
    • One hydrogen atom
    • Three methyl groups

  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 pair of compounds are functional group isomers of each other?

    • Propan-1-ol and propan-2-ol
    • Ethane and ethene
    • Ethanol and ethanal
    • Ethanol and methoxymethane

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

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

  19. Why is propene unable to exhibit E-Z isomerism?

    • Two identical hydrogens
    • Free C-C rotation
    • Too few carbons
    • No double bond

  20. Which type of isomerism is shown by molecules differing only in spatial arrangement around C=C?

    • E-Z stereoisomerism
    • Position isomerism
    • Chain isomerism
    • Functional group isomerism

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