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Shapes of organic molecules; σ and π bonds: CAIE A‑Level Chemistry questions

Every CAIE A-Level Chemistry exam question on 13.3 Shapes of organic molecules; σ and π bonds, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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312 questions

  1. Q6(b)

    June 2024 · Paper 4

    2 marks13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 4, question 6(b): The compound C6H6 has many structural isomers. Four suggested structures of C6H6 are shown in Fig. 6.1. Kekulé benzene Dewar benzene Ladenburg benzene delocalis

  2. Q6(d)

    June 2024 · Paper 4

    1 mark13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 4, question 6(d): Suggest why Dewar benzene and Ladenburg benzene are unstable isomers of C6H6. [1]

  3. Q26

    June 2024 · Paper 1

    1 mark13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 1, question 26: The diagram shows the structure of X. X NC H H H Which row is correct? number of type of hybridisation of  bonds in X the carbon atoms in X A 4 sp and sp2 B 4

  4. Q5(b)(i)

    June 2024 · Paper 2

    1 mark13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 2, question 5(b)(i): Identify the hybridisation of the carbon atoms in a C=C bond in an alkene. [1]

  5. Q5(b)(ii)

    June 2024 · Paper 2

    2 marks13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 2, question 5(b)(ii): Draw labelled diagrams to show, in terms of orbital overlap, how the σ and π bonds are made in a C=C bond. σ bond π bond [2]

  6. Q5(c)(i)

    June 2024 · Paper 2

    1 mark13.3 Shapes of organic molecules; σ and π bonds
    The whole paper ↗
    June 2024 Paper 2, question 5(c)(i): Suggest one difference between σ and π bonds that explains why the π bond is broken in electrophilic addition reactions involving alkenes. [1]
All 6 questions on Shapes of organic molecules; σ and π bonds, as a list
  1. June 2024, Paper 4, Q6(b) (2 marks): The compound C6H6 has many structural isomers. Four suggested structures of C6H6 are shown in Fig. 6.1. Kekulé benzene Dewar benzene Ladenburg benzene delocalis
  2. June 2024, Paper 4, Q6(d) (1 mark): Suggest why Dewar benzene and Ladenburg benzene are unstable isomers of C6H6. [1]
  3. June 2024, Paper 1, Q26 (1 mark): The diagram shows the structure of X. X NC H H H Which row is correct? number of type of hybridisation of  bonds in X the carbon atoms in X A 4 sp and sp2 B 4
  4. June 2024, Paper 2, Q5(b)(i) (1 mark): Identify the hybridisation of the carbon atoms in a C=C bond in an alkene. [1]
  5. June 2024, Paper 2, Q5(b)(ii) (2 marks): Draw labelled diagrams to show, in terms of orbital overlap, how the σ and π bonds are made in a C=C bond. σ bond π bond [2]
  6. June 2024, Paper 2, Q5(c)(i) (1 mark): Suggest one difference between σ and π bonds that explains why the π bond is broken in electrophilic addition reactions involving alkenes. [1]

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