Lesson 6A.2

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

20 questions

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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. Bromoethane reacts with aqueous sodium hydroxide to form ethanol. Which reaction type best describes this change?

    • Electrophilic addition, in which the pi bond is attacked by an electron-poor species such as Br2
    • Reduction, in which the halogen atom gains electrons and the carbon is reduced to an alkane
    • Radical elimination, in which a hydrogen atom is removed and a new double bond forms in the chain
    • Nucleophilic substitution, a hydrolysis

  4. Ethanol is oxidised to ethanal using acidified potassium dichromate(VI). Which description is correct?

    • Addition, because the C=O group is added
    • Oxidation, because the alcohol loses hydrogen
    • Polymerisation, because two molecules join
    • Reduction, because the alcohol gains oxygen

  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 of each other?

    • Butan-1-ol and butan-2-ol
    • Ethanol and ethanal
    • Propene and cyclopropane, both C3H6
    • But-2-ene (E) and but-2-ene (Z)

  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 is the conversion of ethene into poly(ethene)?

    • Polymerisation by addition
    • Condensation polymerisation with water released
    • Hydrolysis by a nucleophile
    • Oxidation to a diol

  12. What is meant by the term stereoisomerism?

    • Compounds with the same structural formula but a different spatial arrangement of atoms
    • Compounds with different molecular formulae but the same empirical formula
    • Compounds with the same functional group but different chain lengths
    • Compounds with the same molecular formula and the same connectivity of atoms

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

    • Oxidation
    • Elimination
    • Polymerisation
    • Reduction

  14. Which reaction involves the reduction of an organic molecule?

    • Oxidation of ethanol to ethanoic acid using acidified potassium dichromate(VI) under reflux
    • Dehydration of ethanol to ethene using concentrated phosphoric acid with heat
    • Hydrogenation of an alkene to an alkane with a nickel catalyst
    • Combustion of methane to carbon dioxide and water in a plentiful supply of oxygen in air

  15. Which statement correctly distinguishes structural isomers from stereoisomers?

    • Structural isomers differ in connectivity of atoms, whereas stereoisomers have the same connectivity but differ in spatial arrangement
    • Structural isomers are always optically active and rotate plane-polarised light, whereas stereoisomers are never optically active
    • Structural isomers and stereoisomers have identical physical properties and reactivity, differing only in their spectroscopic labelling
    • Structural isomers have different molecular formulae, whereas stereoisomers share a formula but differ in bonding connectivity

  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. Which compound has the molecular formula C3H6O and could be either an aldehyde or a ketone?

    • Propan-1-ol or propan-2-ol
    • Propanal or propanone
    • Propanoic acid or methyl ethanoate
    • Propene or cyclopropane

  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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