plumiBonding and structure: OCR A‑Level Chemistry B questions
Every OCR A-Level Chemistry B exam question on DF Bonding and structure (specification points DF(b)–(c)), 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q31(b)(i)
The whole paper ↗![June 2025 Paper 1, question 31(b)(i): The double bond in oleic acid consists of a σ bond and a π bond. Describe how π bonds are formed. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43301-jun25-31-bi-qp.webp?v=3)
![June 2024 AS Paper 1, question 18: A hydrocarbon molecule has 9 σ bonds and 2 π bonds. What is the hydrocarbon? A CH2CHCHCHCH3 B CH2CHCH2CH3 C CH2CHCHCH2 D CH2CHCH3 Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-jun24-18-qp.webp?v=3)
Q3(e)(ii)
The whole paper ↗![June 2024 AS Paper 2, question 3(e)(ii): Complete the diagram to show the three-dimensional structure of a methanol molecule. Use solid and dashed wedges to represent bonds where necessary. H C O [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-03-eii-qp.webp?v=3)
![June 2023 AS Paper 1, question 18: How many π and σ bonds are there in one molecule of 2‑methylpropene? π bonds σ bonds A 1 10 B 1 11 C 2 3 D 2 10 Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-jun23-18-qp.webp?v=3)
Q35(b)
The whole paper ↗![June 2022 Paper 1, question 35(b): Complete the diagram below to show the molecular shape around the nitrogen atom in the part of benzocaine shown. Use lines and wedges as appropriate. N [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43301-jun22-35-b-qp.webp?v=3)
Q2(b)
The whole paper ↗![June 2022 Paper 2, question 2(b): Give the number of π bonds and σ bonds in but-2-ene, CH3CH=CHCH3. π bonds σ bonds [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun22-02-b-qp.webp?v=3)
Q2(b)(i)
The whole paper ↗![November 2021 Paper 3, question 2(b)(i): Explain the significance of the dashed line and the wedge shown on the structure. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43303-nov21-02-bi-qp.webp?v=3)
![November 2021 AS Paper 1, question 7: How many σ and π bonds are there in a molecule of propene, CH3CH=CH2? σ π A 1 2 B 6 2 C 7 1 D 8 1 Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-nov21-07-qp.webp?v=3)
Q1(a)(i)
The whole paper ↗
Q1(a)(ii)
The whole paper ↗
![November 2020 AS Paper 1, question 2: How many π bonds and σ bonds are there in a molecule of propene? π bonds σ bonds A 1 8 B 1 7 C 2 8 D 2 7 Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-nov20-02-qp.webp?v=3)
Q1(b)(i)
The whole paper ↗
Q1(b)(ii)
The whole paper ↗![November 2020 AS Paper 2, question 1(b)(ii): Explain the meaning of the wedge bond ( ) in terms of the 3-D shape of ethene. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-nov20-01-bii-qp.webp?v=3)
Q5(c)(i)
The whole paper ↗![June 2019 Paper 2, question 5(c)(i): Explain why the remaining p orbital contains one electron. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun19-05-ci-qp.webp?v=3)
Q5(c)(ii)
The whole paper ↗![June 2019 Paper 2, question 5(c)(ii): State what happens to these single p electrons in the structures of ethene and naphthalene. ethene naphthalene [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun19-05-cii-qp.webp?v=3)
![June 2018 Paper 2, question 2(b)(i): How many σ and π bonds are there in a propene molecule? Number of σ bonds Number of π bonds [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun18-02-bi-qp.webp?v=3)
![June 2018 Paper 2, question 2(b)(ii): Propene has a H–C–H bond where the C atom forms a double bond. What is the bond angle of this H–C–H bond? [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun18-02-bii-qp.webp?v=3)
All 22 questions on Bonding and structure, as a list
- June 2025, Paper 1, Q31(b)(i) (1 mark): The double bond in oleic acid consists of a σ bond and a π bond. Describe how π bonds are formed. [1]
- June 2024, Paper 1, Q12 (1 mark): Which of the following is correct for a C=C bond? A All the electrons are between the C atoms. B There are two π-bonds. C There is one σ-bond. D The bond can fr
- June 2024, Paper 1, Q30 (1 mark): A carbon atom has the bonding shown. C Which of the following is/are correct for this carbon atom? 1 The shape is trigonal around the carbon atom. 2 The atoms a
- June 2024, AS Paper 1, Q18 (1 mark): A hydrocarbon molecule has 9 σ bonds and 2 π bonds. What is the hydrocarbon? A CH2CHCHCHCH3 B CH2CHCH2CH3 C CH2CHCHCH2 D CH2CHCH3 Your answer [1]
- June 2024, AS Paper 2, Q3(e)(ii) (1 mark): Complete the diagram to show the three-dimensional structure of a methanol molecule. Use solid and dashed wedges to represent bonds where necessary. H C O [1]
- June 2023, Paper 1, Q11 (1 mark): Which row shows the number of sigma (σ) and pi (π) bonds in one molecule of buta-1,3-diene, CH2=CHCH=CH2? Sigma (σ) bonds Pi (π) bonds A 7 2 B 7 4 C 9 2 D 9 4 Y
- June 2023, AS Paper 1, Q18 (1 mark): How many π and σ bonds are there in one molecule of 2‑methylpropene? π bonds σ bonds A 1 10 B 1 11 C 2 3 D 2 10 Your answer [1]
- June 2022, Paper 1, Q35(b) (1 mark): Complete the diagram below to show the molecular shape around the nitrogen atom in the part of benzocaine shown. Use lines and wedges as appropriate. N [1]
- June 2022, Paper 2, Q2(b) (1 mark): Give the number of π bonds and σ bonds in but-2-ene, CH3CH=CHCH3. π bonds σ bonds [1]
- November 2021, Paper 3, Q2(b)(i) (1 mark): Explain the significance of the dashed line and the wedge shown on the structure. [1]
- November 2021, AS Paper 1, Q7 (1 mark): How many σ and π bonds are there in a molecule of propene, CH3CH=CH2? σ π A 1 2 B 6 2 C 7 1 D 8 1 Your answer [1]
- November 2021, AS Paper 2, Q1(a)(i) (2 marks): Complete the diagram below to show the 3-D shape around the carbon atom in the CH3 group. Use the notation of solid and dashed wedges. Give the H–C–H bond angle
- November 2021, AS Paper 2, Q1(a)(ii) (1 mark): The C=C bond consists of a sigma(σ)-bond and a pi(π)-bond. The diagram below shows a representation of the σ-bond. Complete the diagram to show a representation
- November 2020, AS Paper 1, Q2 (1 mark): How many π bonds and σ bonds are there in a molecule of propene? π bonds σ bonds A 1 8 B 1 7 C 2 8 D 2 7 Your answer [1]
- November 2020, AS Paper 2, Q1(b)(i) (1 mark): The diagram of ethene below shows the position of the sigma(σ) bond between the carbon atoms. On the diagram sketch the shape and position of the pi(π) bond. H
- November 2020, AS Paper 2, Q1(b)(ii) (1 mark): Explain the meaning of the wedge bond ( ) in terms of the 3-D shape of ethene. [1]
- June 2019, Paper 2, Q5(c)(i) (2 marks): Explain why the remaining p orbital contains one electron. [2]
- June 2019, Paper 2, Q5(c)(ii) (2 marks): State what happens to these single p electrons in the structures of ethene and naphthalene. ethene naphthalene [2]
- June 2018, Paper 2, Q2(b)(i) (1 mark): How many σ and π bonds are there in a propene molecule? Number of σ bonds Number of π bonds [1]
- June 2018, Paper 2, Q2(b)(ii) (1 mark): Propene has a H–C–H bond where the C atom forms a double bond. What is the bond angle of this H–C–H bond? [1]
- June 2017, AS Paper 2, Q2(b)(i) (1 mark): Name the types of bond represented by A and B. Bond A Bond B [1]
- June 2017, AS Paper 2, Q2(e)(ii) (1 mark): Draw a diagram to show the three-dimensional arrangement of the atoms around the carbon atom C* in 1-phenyl-1-bromoethane. [1]
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