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Organic Mechanisms (AQA A Level Chemistry): Exam Questions

Exam code: 7405

3 hours30 questions

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Organic Mechanisms

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11 mark

Ethanol can react to form ethene in the presence of concentrated sulfuric acid, H2SO4, at 300 ℃.

Which of the following descriptions is correct for the first mechanism arrow?

  • From :OH to H in H2SO4

  • From C-O bond to positively charged O atom

  • From H in H2SO4 to :OH 

  • From H-C bond to C-C bond 

Choose your answer

21 mark

Which mechanism does not occur in the following reaction sequence?

7-9-e-q2-mcq-aqa-al-chemistry

  • Nucleophilic addition

  • Nucleophilic substitution 

  • Nucleophilic addition elimination

  • Free radical substitution 

Choose your answer

31 mark

Which mechanism occurs when potassium cyanide, KCN, reacts with an aldehyde?

  • Nucleophilic substitution

  • Nucleophilic addition

  • Electrophilic substitution

  • Nucleophilic addition elimination 

Choose your answer

41 mark

Which mechanism occurs between phenylamine and chloroethane?

  • Electrophilic substitution 

  • Free radical substitution 

  • Nucleophilic addition elimination 

  • Nucleophilic substitution 

Choose your answer

51 mark

Which of the arrows in the following mechanism is not correct?

7-9-e-q5-mcq-aqa-al-chemistry

    Choose your answer

    11 mark

    In the mechanism shown, which of the arrows is not correct?

    7-9-m-q1-mcq-aqa-al-chemistry

      Choose your answer

      21 mark

      In the reaction scheme outlined, which mechanism occurs in Step 1?

      7-9-m-q2-mcq-aqa-al-chemistry

       

      • Elimination

      • Nucleophilic addition 

      • Nucleophilic substitution 

      • Electrophilic addition 

      Choose your answer

      31 mark

      Propanone can be used to form 2-hydroxy-2-methylpropanenitrile.

      Which of the following descriptions is correct for the first two mechanism arrows?

       

      Arrow 1

      Arrow 2

      A

      From :OH- nucleophile to δ+ C atom

      From δ- O atom bond to C=O atom

      B

      From :CN- nucleophile to δ- C atom

      From lone pair on O atom to H+ ion

      C

      From :CN- nucleophile to δ+ C atom

      From C=O bond to δ- O atom

      D

      From :OH- nucleophile to δ- C atom

      From δ- O atom bond to C=O atom

        Choose your answer

        41 mark

        The products formed from the reaction between butan-1-ol with ethanoic anhydride are

        • Water and ethyl butanoate 

        • Ethanoic acid and butyl ethanoate 

        • Water and butyl ethanoate

        • Ethanoic acid and ethyl butanoate

        Choose your answer

        51 mark

        Which equation does not represent the formation of an electrophile?

        • CH3CH2Cl + AlCl3 → CH3CH3+ + AlCl4-

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

        • CH3COCl + AlCl3 → CH3CO+ + AlCl4-

        • CH3Br + AlBr3 → CH3+ + AlBr4-

        Choose your answer

        11 mark

        Which alkene reacts with hydrogen chloride to give 2-chloro-3-methylpentane as the major product?

        • CH3CH2C(CH3)=CHCH3

        • CH3CH2CH2CH=CHCH3

        • CH3CH2C(CH3)=CH2

        • CH3CH2CH(CH3)CH=CH2

        Choose your answer

        21 mark

        Some compounds form racemic mixtures when potassium cyanide, KCN (aq), and dilute hydrochloric acid, HCl (aq), are added.

        Which of the below will form a racemic mixture?

        • HCHO

        • (CH3)2CO

        • CH3CH2CHO

        • (C3H7)2CO

        Choose your answer

        31 mark

        The reaction between butanoyl chloride, CH3CH2CH2COCl, and benzene, C6H6, is an example of acylation.

        Which of the following correctly demonstrates part of the reaction mechanism?

        • 7-9-h-q3-a-mcq-aqa-al-chemistry
        • 7-9-h-q3-b-mcq-aqa-al-chemistry
        • 7-9-h-q3-c-mcq-aqa-al-chemistry
        • 7-9-h-q3-d-mcq-aqa-al-chemistry

        Choose your answer

        41 mark

        A mixture of products are made when methylamine, CH3NH2, and chloroethane, CH3CH2Cl, react by nucleophilic substitution.

        Which of the following is not a possible product?

        • C2H5NHCH3

        • (C2H5)2NCH3

        • [(C2H5)3NCH3]⁺Cl ⁻

        • [(C2H5)2N(CH3)2]⁺Cl ⁻

        Choose your answer

        51 mark

        4-methylphenylamine is formed during the following reaction scheme.

        Which combination of reagents are required for each step?

        7-9-h-q5-mcq-aqa-al-chemistry

         

        Step 1

        Step 2

        A

        Conc H2SO4 and conc HCl

        Ni and H2,

        B

        Conc H2SO4 and conc HNO3

        Sn and conc HCl

        C

        Conc H2SO4 and conc HNO3

        NaBH4 and conc HCl

        D

        Conc HNO3 and conc HCl

        Sn and conc H2SO4,

          Choose your answer