plumiAlkenes: unsaturation, σ and π bonds: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 5.1.1 Alkenes: unsaturation, σ and π bonds, 2019–2025, with mark schemes and examiner’s reports where available.
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All 15 questions on Alkenes: unsaturation, σ and π bonds, as a list
- January 2025, AS Unit 1, Q19 (1 mark): β-Farnesene is an alarm pheromone released by aphids. How many π bonds and how many σ bonds are present in this molecule? A 4π and 31σ B 4π and 38σ C 8π and 28σ
- October 2024, AS Unit 1, Q15(a) (1 mark): What is the general formula of cyclic alkenes such as cyclohexene? (1) A CnH2n – 4 B CnH2n – 2 C CnH2n D CnH2n + 2
- June 2024, AS Unit 1, Q3(a) (1 mark): What is the molecular formula of limonene? (1) A C10H10 B C10H16 C C10H18 D C10H22
- June 2024, AS Unit 1, Q19(a) (1 mark): Margarines are sold as unsaturated fats. State the meaning of the term unsaturated. (1)
- January 2024, AS Unit 1, Q18(b) (4 marks): The carbon–carbon double bond consists of a σ bond and a π bond. Describe the difference between the σ bond and the π bond. Include a labelled diagram in your a
- October 2023, AS Unit 1, Q16 (1 mark): A cyclic hydrocarbon has the structure shown. How many pi (π) and sigma (σ) bonds are present in the molecule? pi (π) bonds sigma (σ) bonds A 2 11 B 2 5 C 4 3 D
- October 2023, AS Unit 1, Q20(a)(i) (4 marks): Draw the skeletal formulae of the four structural isomers of X that are alkenes. Do not include geometric isomers. (4)
- January 2023, AS Unit 3, Q1(a) (2 marks): P has the molecular formula C6H12. P is a straight‑chain molecule that contains one functional group. Bromine water is decolourised when shaken with P. Identify
- October 2022, AS Unit 1, Q15(b) (4 marks): Another way to produce iso‑octane is by reacting iso‑butane with 2‑methylpropene. + iso‑butane 2‑methylpropene iso‑octane Draw the skeletal formulae of four iso
- January 2022, AS Unit 1, Q21(a) (2 marks): Complete the diagram to show the areas of electron density for each bond. Label the σ bond and the π bond. (2) C C
- January 2022, AS Unit 1, Q21(c)(i) (1 mark): Give the molecular formula of alpha-ocimene. (1)
- October 2021, AS Unit 1, Q11(b) (1 mark): What is the total number of sigma bonds in Z-2-chlorobut-2-ene? (1) A 3 B 4 C 10 D 11
- June 2021, AS Unit 1, Q23(a) (1 mark): An alkene has a molar mass of 112 g mol−1. Deduce the molecular formula of this alkene. (1)
- January 2020, AS Unit 1, Q16 (1 mark): What is the number of ı bonds and ʌ bonds in one molecule of this compound? ı bonds ʌ bonds A 15 3 B 39 3 C 15 6 D 39 6 Use this space for any rough working. An
- January 2019, AS Unit 1, Q16 (1 mark): Ethene reacts with hydrogen in the presence of a heated nickel catalyst to form ethane. H H H H C C + H2 H C C H H H H H Which types of bond are broken and form
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