Lesson 4.1.1

4.1.1 Basic concepts of organic chemistry Quiz: OCR Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.1, Basic concepts of organic chemistry: 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 IUPAC name of CH3CH2CH(CH3)CH2OH?

    • 2-ethylpropan-1-ol
    • 2-methylbutan-1-ol
    • 3-methylbutan-1-ol
    • 2-methylpentan-1-ol

  2. What is the general formula of an alkane?

    • CnH2n
    • CnH2n+2
    • CnH2n+1
    • CnH2n-2

  3. What is the general formula of an alkyl group?

    • CnH2n
    • CnH2n+1
    • CnH2n+2
    • CnH2n-1

  4. Successive members of a homologous series differ from each other by which structural unit?

    • CH
    • CH3
    • C2H4
    • CH2

  5. Which of these compounds is aromatic?

    • Hexane
    • Cyclohexane
    • Cyclohexene
    • Benzene

  6. Which compound is alicyclic?

    • Benzene
    • Butane
    • Cyclohexane
    • Ethene

  7. Structural isomers are molecules with the same molecular formula but a different what?

    • Empirical formula
    • Molecular mass
    • Structural formula
    • Functional group

  8. How many structural isomers does C4H10 have?

    • 2
    • 4
    • 3
    • 1

  9. What species are formed when a covalent bond undergoes homolytic fission?

    • One ion pair
    • Two radicals
    • Two anions
    • Two cations

  10. What species are formed when a covalent bond undergoes heterolytic fission?

    • Two ions
    • One radical
    • Two molecules
    • Two radicals

  11. What does a full curly arrow represent in an organic reaction mechanism?

    • Proton transfer
    • Single electron movement
    • Atom migration
    • Electron pair movement

  12. Which feature defines a chemical species known as a radical?

    • Negative charge
    • Full outer shell
    • Unpaired electron
    • Positive charge

  13. Which compound is saturated?

    • Cyclohexene
    • Propene
    • Benzene
    • Propane

  14. Which atoms attached to carbon are omitted when drawing a skeletal formula?

    • Carbon atoms
    • Hydrogen atoms
    • Oxygen atoms
    • Halogen atoms

  15. What is the degree of unsaturation of C4H8?

    • 0
    • 3
    • 1
    • 2

  16. What does a single dot represent in a radical chemical formula?

    • Unpaired electron
    • Electron pair
    • Positive charge
    • Covalent bond

  17. Which species are formed by the heterolytic fission of a C-Br bond?

    • Two neutral radicals
    • Free radicals
    • Carbocation and bromide ion
    • Carbanion and bromine atom

  18. Where must the tail of a curly arrow start in a reaction mechanism?

    • Positively charged atom
    • Electrophilic centre
    • Electron pair
    • Atomic nucleus

  19. What is the molecular formula of the seventh member of the alkane homologous series?

    • C6H14
    • C7H16
    • C7H14
    • C7H18

  20. How many structural isomers does C5H12 have?

    • 2
    • 5
    • 4
    • 3

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