O LevelChemistryCambridge (CIE)Exam Questions11. Organic Chemistry11.4 Alkanes

Alkanes (Cambridge (CIE) O Level Chemistry): Multiple Choice Questions

Exam code: 5070

2 hours30 questions

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11.4 Alkanes

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1
1 mark

Which statement about the bonding in a molecule of ethane is correct?

  • Every bond is a double covalent bond.

  • The carbon-carbon bond is ionic and the carbon-hydrogen bonds are covalent.

  • Every bond is a single covalent bond.

  • The two carbon atoms share four electrons with each other.

Choose your answer

2
1 mark

Which equation represents a substitution reaction?

  • CH4 + Cl2 → CH3Cl + HCl

  • C2H4 + Br2 → C2H4Br2

  • CaCO3 → CaO + CO2

  • C10H22 → C8H18 + C2H4

Choose your answer

3
1 mark

Alkanes are generally unreactive.

With which two substances does an alkane react?

  • water and oxygen

  • oxygen and chlorine

  • water and sodium hydroxide

  • sodium hydroxide and chlorine

Choose your answer

4
1 mark

An alkane burns completely in excess oxygen.

Which products are formed?

  • carbon and water

  • carbon monoxide and water

  • carbon dioxide and water

  • carbon dioxide and hydrogen

Choose your answer

5
1 mark

Which compound is a saturated hydrocarbon?

  • C2H4

  • C2H5OH

  • CH3COOH

  • C2H6

Choose your answer

1
1 mark

When the number of atoms in a molecule of a hydrocarbon increases, the amount of energy released when it burns increases.

What is the correct order?

 

less energy

→

more energy released

A

methane

ethene

ethane

B

ethene

ethane

methane

C

ethene

methane

ethane

D

methane

ethane

ethene

    Choose your answer

    2
    1 mark

    How many moles of hydrogen chloride are formed when one mole of methane reacts with a large excess of chlorine in sunlight?

    • 1

    • 2

    • 3

    • 4

    Choose your answer

    3
    1 mark

    Ethane reacts with chlorine in a substitution reaction.

    Which row gives the condition needed for this reaction, and the reason that condition is needed?

    condition

    reason the condition is needed

    A

    ultraviolet light

    it provides the activation energy

    B

    ultraviolet light

    it lowers the activation energy

    C

    a high temperature

    it lowers the activation energy

    D

    a nickel catalyst

    it provides the activation energy

      Choose your answer

      4
      1 mark

      A hydrocarbon does not decolourise aqueous bromine in the dark.

      Which compound could it be?

      • C3H6

      • C4H8

      • C2H4

      • C5H12

      Choose your answer

      5
      1 mark

      One molecule of ethane reacts with one molecule of chlorine in the presence of ultraviolet light.

      Which pair of products is formed?

      • C2H5Cl and H2

      • C2H5Cl and HCl

      • C2H4Cl2 and H2

      • C2H6Cl2 only

      Choose your answer

      1
      1 mark

      The following reaction takes place in the presence of light.

      CH4 + Cl2 + light → CH3Cl + HCl

      What is the name for this reaction?

      • Combustion

      • Polymerisation

      • Thermal decomposition

      • Substitution

      Choose your answer

      2
      1 mark

      Propane reacts with chlorine in a substitution reaction.

      Which row shows the correct formulae of the products and the condition required for this reaction?

      formulae of products

      condition

      A

      C3​H7​Cl and H2​

      ultraviolet light

      B

      C3​H7​Cl and HCl

      ultraviolet light

      C

      C3​H7​Cl and HCl

      high temperature and a catalyst

      D

      C3​H7​Cl and H2

      high temperature and a catalyst

        Choose your answer

        3
        1 mark

        Which equations represent reactions that ethane undergoes?

        1  C2H6 + Cl2 → C2H5Cl + HCl

        2  C2H6 + Br2 → C2H4Br2 + H2

        3  2C2H6 + 7O2 → 4CO2 + 6H2O

        • 1 and 2

        • 2 and 3

        • 1 and 3

        • 3 only

        Choose your answer

        4
        1 mark

        Propane, C3H8, reacts with chlorine in the presence of ultraviolet light.

        Several different products are formed.

        Which compound could not be formed in this reaction?

        • C3H8Cl2

        • C3H7Cl

        • C3H6Cl2

        • C3H5Cl3

        Choose your answer

        5
        1 mark

        Pentane is an unbranched alkane with five carbon atoms.

        Pentane reacts with chlorine in the presence of ultraviolet light.

        How many different compounds are formed in which exactly one hydrogen atom has been replaced by a chlorine atom?

        • 1

        • 2

        • 3

        • 5

        Choose your answer