plumiPi bonds and the shape of alkenes: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.1.3.1 Pi bonds and the shape of alkenes, 2016–2025, with mark schemes and examiner’s reports where available.
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Q16(b)
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Open the full PDFYour answerQ16(a)(i)
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Open the full PDFYour answerQ16(c)
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Open the full PDFYour answerQ3(a)(i)
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All 11 questions on Pi bonds and the shape of alkenes, as a list
- June 2025, Paper 2, Q16(b) (3 marks): The table below shows incomplete information about two hydrocarbons. Complete the table. Skeletal formula Molecular formula Number of σ bonds Number of π bonds
- June 2024, Paper 2, Q4 (1 mark): The structure of but-1-ene is shown below. x y Which row has the correct shape around carbon atoms labelled x and y? x y A Tetrahedral Pyramidal B Trigonal plan
- June 2022, AS Paper 1, Q14 (1 mark): What is the number of σ-bonds in the molecule below? A 1 B 3 C 7 D 9 Your answer [1]
- November 2021, Paper 2, Q16(a)(i) (2 marks): Explain what is meant by the terms σ-bond and π-bond. σ-bond: π-bond: [2]
- November 2021, Paper 2, Q16(a)(ii) (2 marks): How many σ- and π-bonds are in one molecule of buta-1,3-diene? σ-bonds: π-bonds: [2]
- November 2020, Paper 2, Q2 (1 mark): Which statement about bonds is correct? A The C=C bond in ethene is more polar than the C−C bond in ethane. B A σ-bond is stronger than a π-bond. C The H−C−H bo
- June 2019, Paper 2, Q5 (1 mark): Which types of bonds are broken and formed in the reaction of ethene and bromine? Types of bond broken Types of bond formed A σ π B π σ C σ and π π D σ and π σ
- June 2019, AS Paper 1, Q14 (1 mark): What is the best description for the bonding between the carbon atoms in an ethene molecule? A One σ-bond and one π-bond B One π-bond C Two σ-bonds D Two π-bond
- June 2017, Paper 2, Q16(c) (1 mark): The C=C group in an alkene contains a π-bond. Complete the diagram below to show how p-orbitals are involved in the formation of a π-bond. [1]
- June 2016, AS Paper 1, Q16 (1 mark): The displayed formula for a hydrocarbon is shown below. H H H C H C C H C C H H H How many σ and π bonds are present in a molecule of this hydrocarbon? σ bonds
- June 2016, AS Paper 2, Q3(a)(i) (1 mark): Describe one difference between the σ bond and the π bond. [1]
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