IGCSEChemistryCambridge (CIE)Exam Questions11. Organic ChemistryOrganic Families

Organic Families (Cambridge (CIE) IGCSE Chemistry): Exam Questions

Exam code: 0620 & 0971

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1
1 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

Choose your answer

2
1 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

    Choose your answer

    3
    1 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.

    Choose your answer

    4
    1 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

    Choose your answer

    5
    1 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

      Choose your answer

      6
      1 mark

      Petroleum is separated into fractions by fractional distillation.

      Which statement about the properties of the fractions is correct?

      • The boiling point of the fractions decreases as the number of carbon atoms in the molecules increases.

      • Fractions containing smaller molecules are collected at the bottom of the column where the temperature is highest.

      • The viscosity of the fractions increases as the chain length increases because the intermolecular forces become stronger.

      • Fractions with longer carbon chains are used as refinery gas because they are more volatile.

      Choose your answer

      1
      1 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

      Choose your answer

      2
      1 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

      Choose your answer

      3
      1 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

      Choose your answer

      4
      1 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

        Choose your answer

        5
        1 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

        Choose your answer

        6
        1 mark

        X, Y and Z are organic compounds.

        Some properties of these compounds are listed.

        • Y and Z decolourise bromine water, while X does not.

        • X and Z has the same number of carbons. Y has one carbon atom more in the chain.

        • X is manufactured by the hydration of Z with steam.

        Which row identifies correctly X, Y and Z?

        X

        Y

        Z

        A

        ethanol

        propene

        ethene

        B

        ethanol

        butene

        ethene

        C

        ethene

        propene

        ethanol

        D

        ethene

        butene

        ethanol

          Choose your answer

          7
          1 mark

          Ethanol can be manufactured by fermentation or by the catalytic addition of steam to ethene

          Three statements comparing these two processes are shown.

          1. The hydration of ethene uses non-renewable raw materials, whereas fermentation uses renewable raw materials.

          2. Hydration is carried out as a batch process, making it less efficient than fermentation.

          3. Hydration requires high temperatures and pressures, whereas fermentation requires a low and controlled temperature.

          Which statements are correct?

          • 1 and 2

          • 1 and 3

          • 2 and 3

          • 1, 2 and 3

          Choose your answer

          1
          1 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

            Choose your answer

            2
            1 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

            Choose your answer

            3
            1 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.

            Choose your answer

            4
            1 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

            ✗

            ✗

            ✓

              Choose your answer

              5
              1 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

              Choose your answer

              6
              1 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

                Choose your answer

                7
                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

                8
                1 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.

                Choose your answer

                9
                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

                  10
                  1 mark

                  The displayed formula of an ester is shown.

                  H–C(=O)–O–C–C–C–C–H. Carbonyl carbon double-bonded to O and single-bonded to O and H. Four-carbon chain attached; terminal C has three H, internal C each two H.

                  Which carboxylic acid and which alcohol react to form this ester?

                  carboxylic acid

                  alcohol

                  A

                  butanoic acid

                  methanol

                  B

                  butanoic acid

                  butan-1-ol

                  C

                  methanoic acid

                  methanol

                  D

                  methanoic acid

                  butan-1-ol

                    Choose your answer