Organic Mechanisms (A Level only) (AQA A Level Chemistry)

Exam Questions

3 hours30 questions
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 

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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 

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31 mark

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

  • Nucleophilic substitution

  • Nucleophilic addition

  • Electrophilic substitution

  • Nucleophilic addition elimination 

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41 mark

Which mechanism occurs between phenylamine and chloroethane?

  • Electrophilic substitution 

  • Free radical substitution 

  • Nucleophilic addition elimination 

  • Nucleophilic substitution 

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51 mark

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

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

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    11 mark

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

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

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      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 

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      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

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        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

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        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-

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        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

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        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

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        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

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        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

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        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,

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