Lesson 6C.1

6C.1 Alkene bonding and addition reactions Quiz: Pearson Edexcel Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6C.1, Alkene bonding and addition reactions: 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 is the general formula of the alkenes?

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

  2. Which statement describes the bonding in a C=C double bond?

    • One ionic bond and one covalent bond formed by transfer of electrons between the two carbon atoms
    • One sigma bond formed by head-on overlap and one pi bond formed by sideways overlap of p orbitals
    • Two sigma bonds formed by sideways overlap of p orbitals above and below the plane of the carbon atoms
    • Two pi bonds formed by head-on overlap of s orbitals along the axis of the carbon-carbon bond

  3. Which compound is formed by the catalytic hydrogenation of ethene with a nickel catalyst?

    • Ethanol
    • Ethane
    • Ethanal
    • Ethyne

  4. Why is catalytic hydrogenation of vegetable oils used in margarine production?

    • It converts unsaturated oils into more saturated fats that are solid at room temperature
    • It converts saturated fats into polymers that can be used as flexible packaging for food
    • It adds oxygen to the oil so that the product can be burned later as a fuel in engines
    • It removes the water from the oil so that the product can be stored without spoiling for many months

  5. Ethene reacts with bromine. Which product is formed?

    • Ethyne dibromide, C2H2Br2
    • 1,1-dibromoethane, CH3CHBr2
    • Bromoethane, CH3CH2Br
    • 1,2-dibromoethane, CH2BrCH2Br

  6. Ethene reacts with hydrogen chloride to give a halogenoalkane. Which product is formed?

    • Chloroethene, CH2=CHCl
    • Ethanol, CH3CH2OH
    • Chloroethane, CH3CH2Cl
    • 1,2-dichloroethane, CH2ClCH2Cl

  7. Ethene is passed with steam over an acid catalyst. Which product is formed?

    • Ethanoic acid, CH3COOH
    • Ethanol, CH3CH2OH
    • Ethanal, CH3CHO
    • Ethane-1,2-diol, HOCH2CH2OH

  8. Ethene is oxidised by acidified potassium manganate(VII). Which product is formed?

    • Ethanal, CH3CHO
    • Ethanoic acid, CH3COOH
    • Ethane-1,2-diol, HOCH2CH2OH
    • Ethanol, CH3CH2OH

  9. What mass of 1,2-dibromoethane (Mr = 188) is formed from 14.0 g of ethene (Mr = 28.0) with excess bromine?

    • 28.0 g
    • 47.0 g
    • 94.0 g
    • 188 g

  10. Why are alkenes more reactive than alkanes?

    • Alkanes contain ionic bonds that resist reaction, while alkenes contain only covalent bonds
    • The pi bond has a region of high electron density that is attracted to electrophiles
    • The C=C bond is weaker than a C-H bond in an alkane, so it breaks at a lower temperature
    • The alkene has more hydrogen atoms that can be attacked by nucleophiles in the first step

  11. Which type of bond fission produces ions rather than radicals?

    • Heterolytic fission
    • Homolytic fission
    • Ionic fission by electron removal from a metal
    • Radical fission under UV light

  12. What is the atom economy of the hydrogenation of ethene to ethane, C2H4 + H2 -> C2H6?

    • 50%
    • 100%
    • 93%
    • 7%

  13. What is the systematic name of the product from the hydrogen chloride addition to propene, using Markovnikov's rule?

    • 2-chloropropane
    • Chloroethene
    • 1,2-dichloropropane
    • 1-chloropropane

  14. What type of reaction is the hydrogenation of an alkene?

    • Substitution
    • Elimination
    • Oxidation
    • Addition

  15. What is the Mr of chloroethane, CH3CH2Cl? (Ar: C = 12.0, H = 1.0, Cl = 35.5)

    • 82.5
    • 28.0
    • 50.5
    • 64.5

  16. Which statement best compares the pi bond and sigma bond in ethene?

    • The pi bond is weaker and more reactive because its electron density lies above and below the molecular plane
    • The pi bond is stronger than the sigma bond because it contains more electrons in total
    • The sigma bond is weaker because it is formed by sideways overlap of p orbitals above and below the plane
    • Both bonds are equally reactive because they have the same electron density in the molecule

  17. Which compound is formed by adding steam to propene in the presence of an acid catalyst?

    • Propan-1-ol
    • Propanal
    • Propan-2-ol
    • Propanone

  18. Which compound is produced by the addition of hydrogen to but-1-ene?

    • Butan-1-ol
    • Butanone
    • But-2-ene
    • Butane

  19. What is the molecular formula of the alkene with five carbon atoms?

    • C5H8
    • C6H12
    • C5H12
    • C5H10

  20. What is the empirical formula of ethene, C2H4?

    • CH
    • CH3
    • CH2
    • C2H

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