Why is rotation about the bond axis possible for single-bonded atoms but not double-bonded atoms?

Introductory Chemistry: An Active Learning Approach
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Chapter12: Chemical Bonding
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Problem 56E
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Why is rotation about the bond axis possible for single-bonded atoms but not double-bonded atoms?

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  • A single bond is a sigma bond.
  • A double bond is a one sigma bond and one pi bond.
  • A triple bond is one sigma bond and two pi bond

Geometric isomers:

Geometric isomers are isomer which arises due to different arrangement of atoms or groups around a bond which has restricted rotation.  Geometric isomers are also known as Cis- trans isomerism.

  • If the two atoms locked in the same side of the molecule then it is called cis isomers.
  • If the two atoms locked in the opposite side of the molecule then it is called trans-isomers.
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