Lesson 6A.1

6A.1 Hydrocarbons, functional groups and naming Quiz: Pearson Edexcel Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6A.1, Hydrocarbons, functional groups and naming: 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. Which statement best defines a hydrocarbon?

    • A compound containing only carbon atoms joined in a ring
    • A compound containing carbon and oxygen atoms bonded in a chain
    • A compound containing carbon, hydrogen and at least one halogen atom
    • A compound containing only hydrogen and carbon atoms

  2. What is a functional group?

    • A series of compounds with the same general formula that differ by a CH2 unit
    • The atom or group of atoms responsible for the characteristic reactions of a compound
    • The number of carbon atoms in the longest chain of a molecule
    • The arrangement of atoms in three dimensions around a double bond

  3. Which term describes a series of organic compounds with the same general formula, each differing from the next by a CH2 unit?

    • Empirical series
    • Isomeric series
    • Homologous series
    • Polymeric series

  4. What is the IUPAC name of CH3CH(CH3)CH3?

    • 1-methylpropane
    • 2,2-dimethylethane
    • 2-methylpropane
    • butane

  5. What is the IUPAC name of CH2=CHCH3?

    • Propene
    • Propyne
    • Ethene
    • Propane

  6. What is the molecular formula of the compound with empirical formula CH2 and molar mass 84.0 g mol-1? (Ar: C = 12.0, H = 1.0)

    • C4H8
    • C5H10
    • C6H12
    • C7H14

  7. A compound contains 85.7% carbon and 14.3% hydrogen by mass. What is its empirical formula?

    • CH
    • C2H
    • CH2
    • CH3

  8. A compound has empirical formula CH2O and molar mass 180 g mol-1. What is its molecular formula? (Ar: C = 12.0, H = 1.0, O = 16.0)

    • C6H12O6
    • C12H24O12
    • C2H4O2
    • C3H6O3

  9. Which compound is classified as a hydrocarbon?

    • Ethanoic acid, CH3COOH
    • Ethanol, C2H5OH
    • Propane, C3H8
    • Chloroethane, C2H5Cl

  10. Name the compound CH3CH2CH2CH2OH using IUPAC rules.

    • Butan-2-ol
    • Butanal
    • Butan-1-ol
    • Butanoic acid

  11. Which functional group is present in a carboxylic acid?

    • -COOH, a carbonyl group bonded to a hydroxyl group
    • -CHO, a carbonyl group at the end of a chain
    • -OH, a hydroxyl group bonded to a carbon of a chain
    • -C=C-, a carbon-carbon double bond

  12. What prefix is used in IUPAC names for a chain of seven carbon atoms?

    • Hept-
    • Hex-
    • Oct-
    • Non-

  13. Which pair of compounds are both correctly described as ketones?

    • Ethanal and propan-2-ol
    • Propanal and butanone
    • Propanone and pentan-3-one
    • Methanoic acid and propanone

  14. Which molecular formula corresponds to a saturated hydrocarbon with 8 carbon atoms?

    • C8H18
    • C8H16
    • C8H14
    • C8H20

  15. Which is the correct general formula for a homologous series of alcohols with one OH group?

    • CnH2n+2OH
    • CnH2n+1OH
    • CnH2n+1O
    • CnH2nOH

  16. A compound has empirical formula C2H4O and molar mass 88.0 g mol-1. What is its molecular formula? (Ar: C = 12.0, H = 1.0, O = 16.0)

    • C4H8O2
    • C3H6O
    • C2H4O
    • C6H12O3

  17. In skeletal formulae, what does each vertex at the end of a line normally represent?

    • A double bond drawn between two carbon atoms, which is always written out in full in skeletal formulae
    • An oxygen atom carrying a lone pair of electrons, which is drawn explicitly as a vertex in the skeleton
    • A carbon atom with hydrogen atoms filling its remaining bonds
    • A hydrogen atom bonded directly to the carbon chain, which is shown as a separate labelled vertex

  18. Which is the correct structural formula of ethanol?

    • CH3COOH
    • CH3OCH3
    • CH3CH2OH
    • CH2CH2OH

  19. Which compound is named correctly according to IUPAC rules?

    • 3-chlorobutane-2
    • 2-chlorobutane
    • Butane-2-chloro
    • 2-chloro-butan-3

  20. Which of the following is the general formula for the homologous series of alkanes?

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

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