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What is E-Z isomerism?


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Solution

Isomerism:

  • “The phenomenon of the existence of two or more compounds possessing the same molecular formula but different properties is known as isomerism.”
  • Such compounds are called isomers.

E-Z isomerism:

  • It is a type of stereoisomerism.
  • It applies to alkene which contains C=C double bond and two different groups on both end.

Rules for E-Z system:

  • The atoms or groups attached to each olefinic carbon are given priority as per the sequence rule.
  • If the higher priority groups are present on same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis'.
  • If the higher priority groups are present on opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans'.
  • For example:

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