A LevelChemistryCIETopic Questions13. An Introduction to AS Level Organic Chemistry13.3 Shapes of Organic Molecules; σ & π Bonds

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First teaching 2023

First exams 2025

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Shapes of Organic Molecules; σ & π Bonds (CIE A Level Chemistry)

Topic Questions

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11 mark

How many pi bonds does a molecule of ethene, C2H4 contain?

  • 0

  • 1

  • 2

  • 3

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21 mark

Which type of bond results from the side-to-side overlap of p orbitals?

  • Sigma (σ) bond

  • Pi (π) bond

  • Covalent bond

  • Ionic bond

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31 mark

How many sigma and pi bonds are present in a double bond?

  sigma bonds pi bonds
A 2 0
B 1 1
C 0 2
D 1 2

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41 mark

What is the hybridisation of the carbon atom in methane, CH4?

  • sp

  • sp2 

  • sp3 

  • sp3d

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51 mark

Which of the following molecules is a straight-chain hydrocarbon?

  • Benzene

  • Cyclopentane

  • 2-methylpropane 

  • Propane

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11 mark

Methacrylate acrylonitrile is an organic molecule that contains carbons that are sp, sp2, and sp3 hybridised. 

What is the most likely bond angle for carbon that is sp2 hybridised?

  • 105degree

  • 109degree

  • 120degree

  • 180degree

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21 mark

The amino acid cysteine performs structural and functional roles within proteins. It is used as a nucleophile in enzymatic reactions and can form disulfide bonds with other cysteine molecules. 

3-1-h-4

How many carbon molecules in cysteine are sp2 hybridised?

  • 3

  • 2

  • 1

  • 0

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31 mark

Limonene is found in the peel of citrus fruits.

3-1-cie-ial-chemistry-diagram-q7hard

How many σ and π bonds are present in this molecule?

 

σ

π

A

24

4

B

12

2

C

26

2

D

22

4

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11 mark

Methyl isocyanate, CH3NCO, is a toxic liquid which is used in the production of adhesives. 

The sequence of atoms in a methyl isocyanate molecule is H3C—N=C=O.

What is the approximate angle between the bonds formed by the N atom?

  • 3-1-m-5a

  • 3-1-m-5b

  • 3-1-m-5c

  • 3-1-m-5d

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21 mark

A synthetic molecule called N-acetylcysteine is used as an antidote for patients who have ingested too many paracetamol tablets.

The diagram shows part of the molecule N-acetylcysteine and bond angles have been labelled.

3-1-cie-ial-chemistry-diagram-q7medium

Which is the correct size order of bond angles x, y, z from smallest to largest?

  • x rightwards arrow y rightwards arrow z

  • y rightwards arrow z rightwards arrow x

  • z rightwards arrow y rightwards arrow x

  • z rightwards arrow x rightwards arrow y

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31 mark

A student is building a non-cyclic, chiral alkane from a molymod kit. What is the lowest number of carbon atoms they will need to include in the model? 

  • 6

  • 11

  • 9

  • 7

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