Alkenes (AQA A Level Chemistry)

Exam Questions

3 hours45 questions
11 mark

Which statements about alkenes are correct?

 

They are less reactive than alkanes towards electrophiles

They are used as monomers for polymerisation

They are formed when larger alkanes are cracked

A

B

C

D

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    21 mark

    When bromine reacts with propene in an organic solvent at room temperature, what is the mechanism by which the bromine attacks the propene?

    • Electrophilic addition

    • Electrophilic substitution

    • Nucleophilic addition

    • Nucleophilic substitution

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    31 mark

    Which statements about alkanes and alkenes are correct?

     

    Bromine reacts with alkanes by electrophilic substitution

    Bromine reacts with alkenes by free-radical addition

    Alkenes are formed from alkanes by cracking

    A

    B

    C

    D

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      41 mark

      Which of the following compounds will give a positive unsaturation test result with bromine water?

      q4-3-4-easy-mcq-alkenes-2

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        51 mark

        Which species will not undergo electrophilic addition with an alkene?

        • HBr

        • NaOH

        • Br2

        • H2SO4

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        61 mark

        Which pair of chemicals will give a major and minor product when they undergo electrophilic addition?

        • Ethene + hydrogen bromide

        • Propene + bromine

        • But-1-ene + hydrogen bromide

        • But-1-ene + bromine

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        71 mark

        Which is the most stable carbocation intermediate?

        q7-3-4-easy-mcq-alkenes-1

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          81 mark

          Polyvinyl chloride, PVC, is a common polymer with many everyday uses.

          q8-3-4-easy-mcq-alkenes

          What is the correct IUPAC name for PVC?

          • Poly(chloroethane)

          • Poly(ethane chloride)

          • Poly(chloroethene)

          • Poly(ethene chloride)

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          91 mark

          Which monomer can form the following addition polymer?

          q9-3-4-easy-mcq-alkenes

          • Propene

          • But-1-ene

          • But-2-ene 

          • Pent-1-ene

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          101 mark

          Consider the reaction between but-1-ene and hydrogen bromide to form the minor product.

          q10-3-4-easy-mcq-alkenes

          Which carbocation is formed in the electrophilic addition mechanism of this reaction?

          q10-3-4-easy-mcq-alkenes-1

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            11 mark

            Which of the following statements correctly describes ‘electrophilic addition’?

            • the organic molecule acts as an electrophile and becomes more saturated

            • the organic molecule acts as an electrophile and becomes more saturated

            • the organic molecule acts as a nucleophile and becomes less saturated

            • the organic molecule acts as a nucleophile and becomes more saturated

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            21 mark

            Poly(ethenol) is a polymer used to make dissolvable plastic bags. It can be made by the addition polymerisation of ethenol.

             Which structure contains a section of the polymer poly(ethenol), showing two repeating units?

            q1-3-4-medium-mcq-alkenes

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              31 mark

              Plasticisers, resins and many other chemicals can be made synthetically by polymerisation of a variety of monomers including but-2-en-1-ol, CH3CH=CHCH2OH.

              Which structure is the repeating unit in poly(but-2-en-1-ol)?

              q3-3-4-medium-mcq-alkenes

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                41 mark

                Polyvinyl chloride, PVC, can be used to make pipes, window frames and electrical insulation.

                Plasticisers can be added to change the properties of PVC.

                Which statement about PVC is not correct?

                • the repeat unit of PVC is –(CHCl CH2 )–

                • the empirical formula of PVC is the same as the empirical formula of its monomer

                • PVC molecules are unsaturated

                • combustion of PVC waste produces an acidic gas

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                51 mark

                Poly(tetrafluoroethene), PTFE, is produced through the polymerisation of tetrafluoroethene.

                How does the carbon-carbon bond in tetrafluoroethene compare with that in PTFE?

                • shorter and weaker

                • shorter and stronger

                • longer and weaker

                • longer and stronger

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                61 mark

                Cling film is made through the polymerisation of 1,1-dichloroethene.

                The polymer formed is dense with a high melting point and does not allow gases to pass through which makes it ideal for preserving food.

                Which sequence appears in a short length of the polymer chain?

                •  [ CHClCHClCHClCHClCHClCHCl ]

                • [ CCl2CCl2CCl2CCl2CCl2CCl2 ]

                • [ CH2CCl2CHClCHClCH2CCl2 ]

                • [ CH2CCl2CH2CCl2CH2CCl2 ]

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                71 mark

                A molecule of a polymer contained the sequence shown.

                q7-3-4-medium-mcq-alkenes

                Which monomer could produce this polymer by addition polymerisation?

                • CH3CCl =CHCl

                • CH2=CHCl

                • CHCl =CHCl

                • CH3CCl =CH2

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                81 mark

                Isomers X and Y both react with HBr.

                q8-3-4-medium-mcq-alkenes

                A mixture of X and Y is reacted with HBr.

                Which three structures represent three different possible products of this reaction?

                A

                (CH3)2CHCBr3

                (CH3)2CBrCHBr2

                CH3CHBrCHBrCH3

                B

                (CH3)2CHCBr3

                (CH3)2CBrCHBr2

                CH3CBr2CHBrCH3

                C

                (CH3)2CBrCBr3

                (CH3)2CHCBr3

                CH3CBr2CHBrCH3

                D

                (CH3)2CBrCHBr2

                CHBr2CBr(CH3)CH3

                CH3CHBrCBr2CH3

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                  91 mark

                  Limonene is an oil formed in the peel of citrus fruits.

                  q9-3-4-medium-mcq-alkenes-1

                  Which product is formed when an excess of bromine, Br2 (l), reacts with limonene at room temperature in the dark?

                  q9-3-4-medium-mcq-alkenes-2

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                    101 mark

                    Which compound is produced in the reaction between hex-2-ene and steam?

                    • (CH3)2CHCH2CH2CH2OH

                    • CH3CH2CH2CH2CH(OH)CH3

                    • CH3CH2CH(OH)CH2CH3

                    • CH3CH2CH2CH2CH2CH2OH

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                    11 mark

                    Which compound has an Mr of 84 g mol-1 and will react with HBr to give a product with an Mr of 164.9 g mol-1?

                    q1-3-4-hard-mcq-alkenes

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                      21 mark

                      Which description of 2-methylpropene is correct?

                      • 2-methylpropene is a saturated alkene that undergoes electrophilic addition reactions

                      • 2-methylpropene is an asymmetrical hydrocarbon that forms a mixture of products in reactions with bromine

                      • 2-methylpropene will react with hydrogen bromide to form a tertiary halogenoalkane as the major product

                      • 2-methylpropene contains a centre of high electron density which causes a temporary induced dipole in sulfuric acid

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                      31 mark

                      Propadiene can undergo electrophilic addition with excess hydrogen bromide.

                      Which of the following is not a possible product of the reaction?

                      • 1,2-dibromopropane

                      • 1,3-dibromopropane

                      • 1,1-dibromopropane

                      • 2,2-dibromopropane

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                      41 mark

                      When 2-methylbuta-1,3-diene undergoes electrophilic addition with hydrogen bromide, which of the following carbocations are possible intermediates?

                       

                      Primary

                      Secondary

                      Tertiary

                      A

                      X

                      B

                      X

                      C

                      X

                      D

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                        51 mark

                        Sulfuric acid reacts with 2,3-dimethylpent-2-ene via an electrophilic addition mechanism.

                        Which is the correct pair of carbocation intermediate and product name of the major product?

                        q5-3-4-hard-mcq-alkenes

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                          61 mark

                          An alkene, X, undergoes electrophilic addition with hydrogen bromide to form a halogenoalkane, Y, as the minor product.

                          The halogenoalkane, Y, can react with sodium cyanide to form pentanenitrile.

                          What is the correct identity of the alkene, X?

                          • Methylpropene

                          • But-1-ene

                          • But-2-ene 

                          • Pent-1-ene

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                          71 mark

                          Most polymers tend to melt gradually over a range of temperatures.

                          Which is the correct explanation for this?

                          • The variable chain length of polymers leads to variation in the van der Waals forces

                          • Thermal energy is gradually transferred to kinetic energy which breaks the polymer chain structure

                          • Branching in the polymers reduces the induced dipoles between molecules

                          • Thermal energy used for the state change is lost to the surroundings through gaps in the melting polymer’s structure

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                          81 mark

                          Which structure, containing three repeating units, correctly shows the addition polymer formed by E-but-2-ene?

                          q8-3-4-hard-mcq-alkenes

                           

                          Polymer 1

                          Polymer 2

                          Polymer 3

                          A

                          B

                          X

                          C

                          X

                          X

                          D

                          X

                          X

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                            91 mark

                            This structure shows a section of a polymer chain formed by the random addition polymerisation of three different monomers.

                            q9-3-4-hard-mcq-alkenes

                            Which monomers could produce this polymer?

                            • option-a

                               

                            • option-b

                               

                            • option-c

                               

                            • option-d

                               

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                            101 mark

                            An alkene, X, with a primary alcohol group contains 62.1% carbon and 10.3% hydrogen.

                            Which is the correct structure, containing three repeating units, for the addition polymer formed by only one isomer of the alkene, X?

                            ZAxfFPRX_q10-3-4-hard-mcq-alkenes

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