IGCSEChemistryCambridge (CIE)Exam Questions11. Organic ChemistryOrganic Families

Organic Families (Cambridge (CIE) IGCSE Chemistry)

Exam Questions

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Organic Families

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11 mark

Which of the equations show the incomplete combustion of methane?

  • 2 CH4 + 4O2  → 2 CO2 + 4 H2O

  • CH4 + O2  → C + 2 H2O

  • CH4 + O2  → C + 2 H2

  • 2 CH4 + 4 O2  → 2 CO2 + 4 H2

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21 mark

The diagram shows an industrial process involved in the production of a substance that is used as an aircraft fuel.

q2-11-2-easy-cie-igcse-chemistry

 

process

substance Q

A

fractional distillation

petrol

B

thermal decomposition

paraffin

C

fractional distillation

paraffin

D

thermal decomposition

petrol

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    31 mark

    Which of the following statements about ethanol is not correct?

    • It is formed by a reaction between steam and ethane.

    • It can be used as a fuel.

    • It can be used as a solvent.

    • Its functional group is -OH.

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    41 mark

    Butene and octene belong to the same homologous series.

    What would be the same for butene and octene?

    • Boiling point

    • Number of hydrogen atoms per molecule

    • Relative molecular mass

    • Functional group

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    51 mark

    Ethanol is used as a solvent and fuel, it is produced by the ….1….. of ….2…. .

    Which words would correctly complete the gaps 1 and 2?

     

    1

    2

    A

    combustion

    ethane

    B

    combustion

    glucose

    C

    fermentation

    glucose

    D

    fermentation

    ethane

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      11 mark

      The table below shows 4 different sources of petroleum (crude oil) and their composition.

      Fraction

      Arabian Heavy /%

      Arabian Light /%

      Iranian Heavy /%

      North Sea

      /%

      gasoline

      18

      21

      21

      23

      kerosene

      11.5

      13

      13

      15

      diesel

      18

      20

      20

      24

      fuel oil

      52.5

      46

      46

      38

      Which composition of petroleum would be the best for the motor vehicle industry?

      • North Sea

      • Arabian Heavy

      • Arabian Light

      • Iranian Heavy

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      21 mark

      A student carried out a cracking reaction on hydrocarbon, P, and obtained two products; Q and R.

      q2-11-2-medium-cie-igcse-chemistry

      The student then made the following notes:

      1

      Q is unsaturated.

      2

      R will decolourise bromine water.

      3

      A molecule of P has 7 carbon atoms.

      Which of the statements are correct?

      • 1 & 3

      • 1 & 2

      • 2 & 3

      • 1, 2 & 3

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      31 mark

      Which of the following properties of different compounds in petroleum enable it to be separated into fractions?

       

      1

      Chain length

       

      2

      Chemical reactivity

       

      3

      Solubility in water

       

      4

      Boiling point

      • 1 & 3

      • 1 & 4

      • 2 & 3

      • 2 & 4

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      41 mark

      The diagram below shows the apparatus used to separate petroleum (crude oil) into four fractions.

      q4-11-2-medium-cie-igcse-chem

      Which fraction contains the smallest hydrocarbon molecules?

      fraction

      boiling point range / °C

      A

      up to 70

      B

      71 to 120

      C

      121 to 170

      D

      over 171

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        51 mark

        Ethanol can be produced from substance Y.

        substance Y + steam rightwards arrow with catalyst on top ethanol

        What is substance Y?

        • Ethane

        • Ethene

        • Carbon dioxide

        • Hydrogen

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        11 mark

        The diagram shows a sequence of reactions.

        q1-11-2-hard-cie-igcse-chemistry

        Which row correctly names the processes P, Q and R?

         

        P

        Q

        R

        A

        distillation

        fermentation

        respiration

        B

        distillation

        hydration

        combustion

        C

        cracking

        fermentation

        respiration

        D

        cracking

        hydration

        combustion

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          21 mark

          Hydrocarbons separated by fractional distillation of petroleum can be cracked to make useful shorter chain products.

          Which substance is not a product of the cracking of propane, Mr 44?

          • C4H8

          • C2H4

          • C3H6

          • H2

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          31 mark

          Which of these statements about carboxylic acids is not correct?

          • Aqueous ethanoic acid has a pH less than 7.

          • Methyl orange turns yellow in aqueous ethanoic acid.

          • They produce carbon dioxide when reacted with a metal carbonate.

          • They contain the functional group -COOH.

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          41 mark

          The diagram shows the structure of a compound, X.

          eZj_lZpx_q4-11-2-hard-cie-igcse-chemistry

          Which row correctly describes the properties of X?

           

          colourless

          characteristic smell

          dissolves in water

          A

          ✓

          ✗

          ✓

          B

          ✓

          ✓

          ✗

          C

          ✓

          ✓

          ✓

          D

          ✗

          ✗

          ✓

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            51 mark

            The products of some reactions are shown below.

            Which row correctly identifies the products of a reaction between a carboxylic acid and an alcohol?

            • Alkene and water

            • Alkane and water

            • Alcohol and water

            • Ester and water

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            61 mark

            The apparatus below was used to test gas Y

            q6-1-11-2-hard-cie-igcse-chemistry

            The bromine solution quickly went colourless.

            What is the correct structure of gas Y?

            q6-2-11-2-hard-cie-igcse-chemistry

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              71 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

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              81 mark

              Which of these is an advantage of producing ethanol by fermentation of sugar compared to the catalytic addition of steam to ethene?

              • The process uses high temperatures.

              • The alcohol produced is purer.

              • The process is faster.

              • The process uses renewable raw materials.

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