Revision NotesExam QuestionsPast Papers
GCSEChemistryOCRChemistry A (Gateway)Exam Questions6.Global ChallengesOrganic Chemistry

Organic Chemistry (OCR GCSE Chemistry A (Gateway)): Exam Questions

Exam code: J248

3 hours62 questions

Select a download format for Organic Chemistry

Scroll for more

Select an answer set to view for
Organic Chemistry

Easy
Medium
Hard
11 mark

Look at the displayed formula of an organic compound.

q1-paper-2-specimen-2016-ocr-gcse-chem

What is the name of this compound?

  • Butanoic acid

  • Butanol

  • Propanoic acid

  • Propanol

Choose your answer

21 mark

DNA is a condensation polymer made from monomers called nucleotides.

How many different nucleotides are used to make DNA molecules?

  • 2

  • 3

  • 4

  • 5

Choose your answer

31 mark

What is the name of the process that converts large alkane molecules into smaller alkane molecules?

  • Cracking

  • Fractional distillation

  • Hydrogenation

  • Polymerisation

Choose your answer

41 mark

Which displayed formula shows an alkene?

q4-paper-2-june-2018-ocr-gcse-chem

    Choose your answer

    51 mark

    A student bubbles ethene gas into bromine water.

    What is observed?

    • Colour change from blue to colourless

    • Colour change from colourless to orange

    • Colour change from orange to colourless

    • Orange precipitate is made

    Choose your answer

    61 mark

    What is the formula of the functional group in alcohols?

    • −CH3

    • −COOH

    • −CO2

    • −OH

    Choose your answer

    71 mark

    What is the displayed formula of ethanol?

    • screenshot-2024-11-06-123322
    • screenshot-2024-11-06-123538
    • screenshot-2024-11-06-123627
    • screenshot-2024-11-06-123712

    Choose your answer

    81 mark

    Methane is a hydrocarbon.

    Which substance cannot be produced when methane burns in air?

    • Carbon

    • Carbon dioxide

    • Hydrogen

    • Water

    Choose your answer

    91 mark

    Crude oil is a resource that is being made extremely slowly.

    Which word describes a resource that is being made extremely slowly?

    • Finite

    • Hydrocarbon

    • Non‐renewable

    • Petrochemical

    Choose your answer

    101 mark

    Which of these homologous series can form addition polymers?

    • Alcohols and carboxylic acids

    • Alkenes and alkanes

    • Alkenes only

    • Carboxylic acids only

    Choose your answer

    11 mark

    Heptane is an alkane with seven carbons.

    What is the chemical formula of heptane?

    • C7H10

    • C7H12

    • C7H14

    • C7H16

    Choose your answer

    21 mark

    The complete combustion of pentane, C5H12, takes place in the following unbalanced equation:

    _C5H12   +   _O2 →   _CO2   +  _H2O

    What numbers will balance the reaction?

    • 1,4,5,3

    • 1,8,5,6

    • 2,8,5,6

    • 2,4,5,6

    Choose your answer

    31 mark

    Which of the following molecules is an alkene?

    • C6H10

    • C4H10

    • C5H10

    • C6H14

    Choose your answer

    41 mark

    The following molecule can undergo addition polymerisation. 

    6-2_q4_1-ocr-gcse-chemistry-mcq-

    What it the correct repeat unit?.

    6-2-q4_2-ocr-gcse-chemistry-mcq

      Choose your answer

      51 mark

      Which of the following is not true about DNA?

      • The structure is a double helix

      • DNA is made from nucleotides

      • DNA is made from two polymer chains

      • The monomers that form DNA are amino acids

      Choose your answer

      61 mark

      The structure of a polymer is shown below.

      6-2-q7_1-ocr-gcse-chemistry-mcq

      What is the correct monomer?

      6-2-q7_2-ocr-gcse-chemistry-mcq

        Choose your answer

        7
        Sme Calculator        1 mark

        Hydrogen fuel cells can be used to power trains.

        Why could people refer to the hydrogen fuel cell trains as the 'new' steam trains?

        • The hydrogen used is extracted from fossil fuels

        • The hydrogen fuel cell trains are slower than diesel trains

        • The reaction produces water that can be released as steam

        • The reaction in the fuel cell is a combustion reaction

        Choose your answer

        81 mark

        Hydrogen fuel cells are often used instead of rechargeable batteries in spacecraft.

        Which of the following is not an advantage of using hydrogen fuel cells in spacecraft?

        • Water is the only product made in the reaction

        • The fuel cells have no moving parts so are easy to maintain

        • Hydrogen and oxygen are easily made by electrolysis of water

        • Hydrogen fuel cells are cheap

        Choose your answer

        91 mark

        Which molecule can be cracked to produce hexane, C6H14?

        • C4H8

        • C4H10

        • C6H12

        • C10H22

        Choose your answer

        101 mark

        Crude oil is a mixture of hydrocarbons.

        Crude oil is separated into useful fractions.

        Which of these mixtures of substances could be in a fraction from crude oil?

        • C2H4, C4H10, C4H10O

        • C2H4, C2H3Br, C4H10

        • C2H6, C3H8, C4H10

        • C2H6, C2H3Br, C4H10O

        Choose your answer

        111 mark

        What happens to the potential difference of a chemical cell once the reactants are used up?

        • It decreases

        • It increases

        • It starts and finishes at 0 V

        • It stays the same

        Choose your answer

        121 mark

        Crude oil is separated into fractions by fractional distillation.

        Look at the diagram of the fractions made in fractional distillation.

        q7-paper-2-nov-2020-ocr-gcse-chem

        Which of these fractions has the lowest boiling point?

        • Bitumen

        • Diesel oil

        • Gases

        • Petrol

        Choose your answer

        131 mark

        What type of reaction takes place between an alkene and hydrogen?

        • Addition

        • Dehydration

        • Neutralisation

        • Thermal decomposition

        Choose your answer

        141 mark

        DNA molecules are polymers.

        What is the name of the monomers that make up DNA molecules?

        • Amino acids

        • Carbohydrates

        • Nucleotides

        • Proteins

        Choose your answer

        151 mark

        Which of the following are the first four members of the homologous series of alcohols?

        • CH4, C2H6, C3H8, C4H10

        • CH3OH, C2H5OH, C3H7OH, C4H9OH

        • HCOOH, CH3COOH, C2H5COOH, C3H7COOH

        • C2H4, C3H6, C4H8, C5H10

        Choose your answer

        161 mark

        Look at the displayed formula of the monomer butene.

        q11-paper-2-june-2018-ocr-gcse-chem

        What is the formula of the polymer formed from butene?

        q11-1-paper-2-june-2018-ocr-gcse-chem

          Choose your answer

          171 mark

          The bar chart shows the amount of some fractions made from 100 tonnes of crude oil by fractional distillation.

          It also shows the amount of each fraction needed for everyday uses.

          q11-paper-2-specimen-2016-ocr-gcse-chem

          Cracking converts large molecules into smaller more useful molecules to make the supply match the demand.

          Which fractions are most likely to be cracked to make the supply match the demand?

          • Gas oil and fuel oil

          • Gas oil and petrol

          • Naphtha, paraffin and fuel oil

          • Petrol and gases

          Choose your answer

          181 mark

          What is the formula of the product in this equation?

          q10-paper-2-june-2018-ocr-gcse-chem

          • C2H2Br

          • C3Br4

          • C2H3Br

          • C2H4Br2

          Choose your answer

          191 mark

          Which displayed formula includes the functional group of an alcohol?

          q15-paper-2-specimen-2016-ocr-gcse-chem

            Choose your answer

            201 mark

            What is the general formula of the fractions produced by the fractional distillation of crude oil?

            • CnH2n

            • CnH2n+2

            • C2H2n+1OH

            • C2n+2H2

            Choose your answer

            211 mark

            Which displayed formula shows butanol?

            q5-paper-4-june-2019-ocr-gcse-chem

              Choose your answer

              221 mark

              Higher Only

              Look at the equations for the reactions that happen at each side of a hydrogen‑oxygen fuel cell. Reaction 1: 2H2 (g) → 4H+ (aq) + 4e– Reaction 2: 4H+ (aq) + O2 (g) + 4e– → 2H2O (g)

               

              Reaction 1

              Reaction 2

              A

              Oxidation because electrons are gained

              Reduction because electrons are lost

              B

              Reduction because electrons are gained

              Reduction because electrons are gained

              C

              Oxidation because electrons are lost

              Reduction because electrons are gained

              D

              Oxidation because electrons are lost

              Oxidation because electrons are lost

              Which row of the table, A, B, C or D, is correct about reactions 1 and 2?

                Choose your answer

                231 mark

                A student reacts a hydrocarbon with bromine water.

                The formula of the product is C3H6Br2.

                Which is the displayed formula of the hydrocarbon?

                q10-paper-4-nov-2020-ocr-gcse-chem

                  Choose your answer

                  241 mark

                  A student bubbles ethene gas into bromine water.

                  Which displayed formula shows the product of this reaction?

                  • ch2br2
                  • c2h4br2
                  • c2h3br
                  • 1-1-c2h4br2

                  Choose your answer

                  251 mark

                  Which of these homologous series can react together to form addition polymers?

                  • Alcohols and carboxylic acids

                  • Alkenes only

                  • Alkenes and alkanes

                  • Carboxylic acids only

                  Choose your answer

                  261 mark

                  A student heats compound X with acidified potassium manganate(VII) solution.

                  The product of the reaction is compound Y.

                  q14-paper-4-specimen-2016-ocr-gcse-chem

                  What is the colour change seen during this reaction?

                  • Colourless to orange

                  • Colourless to purple

                  • Orange to colourless

                  • Purple to colourless

                  Choose your answer

                  271 mark

                  What is the formula of the functional group in alcohols?

                  • −CH3

                  • −COOH

                  • −CO2

                  • −OH

                  Choose your answer

                  11 mark

                  Crude oil is separated into fractions by fractional distillation.

                  Look at the diagram of the fractions made in fractional distillation

                  q3-paper-4-nov-2020-ocr-gcse-chem

                  Which of these fractions has the strongest intermolecular forces?

                  • Bitumen

                  • Diesel oil

                  • Gases

                  • Kerosene

                  Choose your answer

                  21 mark

                  Look at the structure of glycine.

                  q7-paper-4-nov-2020-ocr-gcse-chem

                  Glycine is a monomer that reacts to form proteins.

                  Glycine contains two different functional groups that allow it to undergo polymerisation. What are the two functional groups?

                  • −NH2 and −C=O

                  • −NH2 and −CH2−

                  • −NH2 and −OH

                  • −NH2 and −COOH

                  Choose your answer

                  31 mark

                  Higher Only

                  Which statement explains why polyamides are condensation polymers?

                  • A molecule of water forms each time a hydroxyl link forms.

                  • A molecule of water forms each time an ester link forms.

                  • A molecule of water forms each time an amine group reacts with a carboxylic acid group.

                  • A molecule of water forms each time an alcohol group reacts with a carboxylic acid group.

                  Choose your answer

                  41 mark

                  Which fraction is collected at the top of the fractional distillation column?

                   

                  Melting point range (°C)

                  Boiling point range (°C)

                  A

                  –70 – –60

                  20 – 25

                  B

                  –50 – –40

                  30 – 50

                  C

                  0 – 20

                  100 – 120

                  D

                  20 – 40

                  130 – 160

                    Choose your answer

                    51 mark

                    What is the correct balanced equation for the combustion of hexane, C6H14?

                    • C6H14 + 13O2 → 6CO2 + 7H2O

                    • C6H14 + 6O2 → 6CO2 + 7H2O

                    • 2C6H14 + 19O2 → 12CO2 + 14H2O

                    • 2C6H14 + 26O2 → 12CO2 + 14H2O

                    Choose your answer

                    61 mark

                    Polyesters can be made by condensation polymerisation. Ethanediol can react with butanedioic acid (a carboxylic acid containing two -COOH groups) to make a polymer.

                    6-2-q5_1-ocr-gcse-chemistry-mcq

                    Which of the following is a correct repeat unit for this polymer?

                    6-2-q5_2-ocr-gcse-chemistry-mcq

                      Choose your answer

                      71 mark

                      Which of the following shows the product of the reaction between propene and bromine?

                      6-2-q11-ocr-gcse-chemistry-mcq

                        Choose your answer

                        81 mark

                        Ethene, C2H4, reacts with bromine, Br2, in an addition reaction.

                        Which is the balanced symbol equation for this reaction?

                        • C2H4 + Br2 → C2H3Br + HBr

                        • C2H4 + Br2 → C2H4Br2

                        • C2H4 + 2Br2 → C2Br4 + 2H2

                        • C2H4 + 2Br2 → C2H4Br4

                        Choose your answer

                        91 mark

                        A hydrogen-oxygen fuel cell produces electricity.

                        Hydrogen reacts with oxygen to produce water.

                        What is the equation for the reaction that happens at the anode?

                        • 2H2 (g) + O2 (g) → 2H2O (g)

                        • 4H+ (aq) + 4e- → 2H2 (g)

                        • 2H2 (g) → 4H+ (aq) + 4e-

                        • 4H+ (aq) + O2 (g) + 4e- → 2H2O (g)

                        Choose your answer

                        101 mark

                        Higher Only

                        Which pairs of molecules would react to form a polyester?

                        • q10-paper-4-june-2019-ocr-gcse-chem

                        Choose your answer

                        111 mark

                        Which statement about chemical cells is correct?

                        • They produce a voltage indefinitely.

                        • They produce a voltage once all of the reactants are used up.

                        • They produce a voltage until one of the reactants is completely used up.

                        • They produce a voltage until the reactants are partly used up.

                        Choose your answer

                        121 mark

                        Ethane is a very small hydrocarbon molecule.

                        Which row about ethane is correct?

                         

                        Easy to ignite?

                        Boiling point

                        A

                        ✔

                        high

                        B

                        x

                        high

                        C

                        ✔

                        low

                        D

                        x

                        low

                          Choose your answer

                          131 mark

                          Ethene, C2H4, reacts with bromine in an addition reaction.

                          What is the structural formula of the product?

                          • screenshot-2024-11-06-215709
                          • screenshot-2024-11-06-215713
                          • screenshot-2024-11-06-215717
                          • screenshot-2024-11-06-215723

                          Choose your answer

                          141 mark

                          What is the half equation for the reaction at the anode in a hydrogen/oxygen fuel cell?

                          • 2H2 + O2 → 2H2O

                          • 2H2 → 4H+ + 4e–

                          • 4H+ + 4e– → 2H2

                          • 4H+ + O2 + 4e– → 2H2O

                          Choose your answer