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Aromatic Chemistry (AQA A Level Chemistry): Exam Questions

Exam code: 7405

3 hours30 questions

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Aromatic Chemistry

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11 mark

What are the reagents required for the conversion of benzene to nitrobenzene?

  • Hydrogen gas in presence of nickel catalyst

  • Concentrated nitric acid and concentrated hydrochloric acid

  • Concentrated sulfuric acid and concentrated nitric acid

  • Tin with concentrated hydrochloric acid

Choose your answer

21 mark

Cyclohexene is an unsaturated hydrocarbon and can undergo hydrogenation as shown 

7-4-e-q2-aqa-al-chemistry-mcq

The expected value for the enthalpy value for the hydrogenation of benzene is -360 kJ mol-1. The actual value for the reaction is -208 kJ mol-1.

Which is the correct explanation? 

  • The s orbitals overlap to produce a stable structure

  • The bond length of the C=C bonds are shorter than the C-C bonds

  • Delocalisation of electrons in the benzene ring increases the stability

  • Each carbon in benzene has three covalent bonds

Choose your answer

31 mark

The correct equation for the generation of an electrophile formed in Friedel-Crafts alkylation is

  • CH3CH2Cl + AlCl3 → CH3CH2+ + AlCl4- 

  • HNO3 + 2H2SO4  → NO2+ + 2HSO4- + H3O+

  • AlCl 4- + H+  → AlCl 3 + HCl 

  • CH3COCl + AlCl3 → CH3CO+ + AlCl4- 

Choose your answer

41 mark

Which part of the following mechanism is not correct?

7-4-e-q4-aqa-al-chemistry-mcq

    Choose your answer

    51 mark

    Which product is formed when benzene, C6H6, reacts with ethanoyl chloride, CH3COCl, in the presence of aluminium chloride, AlCl3?

    • C6H6COCH3

    • HCl

    • C6H5CH3CO

    • C6H5CH2CH3

    Choose your answer

    11 mark

    Benzene can undergo nitration to form nitrobenzene. Which of the following statements is not correct?

    • Concentrated nitric acid acts as a base

    • A nitronium ion acts as an electrophile

    • HSO4- is produced in the formation of the electrophile

    • Aluminum chloride is required as a catalyst for the reaction

    Choose your answer

    21 mark

    Which of the following reagents would be suitable for the reduction of nitrobenzene to produce phenylamine?

    • LiAlH4 in dry ether

    • NaBH4

    • Fe in presence of HCl

    • H2 in presence Mg catalyst

    Choose your answer

    31 mark

    A student reacted 2.5 g of methylbenzene, C6H5CH3, with one mole of bromine, Br2, in the presence of aluminium bromide, AlBr3. 

    The mass of the organic product formed is

    • 6.8 g

    • 2.2 g

    • 4.6 g

    • 4.7 g

    Choose your answer

    41 mark

    Which of the following is correct?

           

    Bond angles present in cyclohexene

    A

    109.5 o only

    B

    109.5 o and 120 o

    C

    120 o only

    D

    109.5 o and 107 o

      Choose your answer

      51 mark

      Which of the following explains why the enthalpy of hydrogenation of benzene is lower than expected?

      • The overlap of p-orbitals allows electrons to become delocalised

      • Benzene contains both single and double bonds

      • The carbon-carbon bond lengths in benzene are shorter than a carbon-carbon single bond

      • Benzene contains sp2 hybridised carbon atoms

      Choose your answer

      11 mark

      Which statement correctly explains the difference between the enthalpy change for the hydrogenation of cyclohexa-1,4-diene and the hydrogenation of cyclohexa-1,3-diene?

      • Cyclohexa-1,4-diene is less stable than cyclohexa-1,3-diene

      • Cyclohexa-1,4-diene is more stable than cyclohexa-1,3-diene

      • There is greater overlap of pi bonds in cyclohexa-1,4-diene

      • The C=C double bonds are closer together cyclohexa-1,3-diene which creates repulsion

      Choose your answer

      21 mark

      Propene reacts with benzene in the presence of aluminium chloride and hydrogen chloride.

      What are the most likely products of this reaction?

      • C6H5CH2CH2CH3, AlCl3 and HCl 

      • C6H5CH(CH3)2, AlCl3 and HCl 

      • C6H5COCH2CH3, AlCl3 

      • C6H5CH2CH3, AlCl3 and HCl 

      Choose your answer

      31 mark

      Which statement about the reactions of benzene is correct?

      • Ammonia is not a strong enough nucleophile to undergo nucleophilic substitution with benzene 

      • During electrophilic substitution, the electrophile attacks the delocalised electrons in the benzene ring 

      • Addition reactions do not require delocalised electrons to form new bonds

      • The delocalised system in benzene will repel attack from a nucleophile 

      Choose your answer

      41 mark

      Which product(s) are formed when the theoretical compound cyclohexa-1,3,5-triene reacts with one molecule of bromine?

      7-4-h-q4-aqa-al-chemistry-mcq

        Choose your answer

        51 mark

        Compound B, C8O3H7N, is formed in two steps from benzene. What are the possible steps for the formation of compound B.

         

        Step 1

        Step 2

          A    

        AlCl3 and CH3COCl

        Conc HNO3 and H2SO4

        B

        Conc HNO3 and H2SO4

        AlCl3, HCl, and C2H4

        C

        Conc HNO3 and H2SO4

        Sn, conc HCl and NaOH

        D

        AlCl3 and CH3COCl

        Sn, conc HCl and NaOH

          Choose your answer