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Cahn-Ingold-Prelog Priority Rules in Chemistry

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Which term below best describes two compounds that have the same chemical formula, the same atom connectivity, but differ in their three-dimensional orientation or shape?

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1. A carbon atom that was determined to be a stereocenter within a molecule has hydrogen, oxygen, chlorine, and nitrogen atoms bonded to it. Which atom would receive priority group number 3 according to the CIP priority rules?

2. Consider the molecule shown below. According to the CIP priority rules, which atom would be labeled as priority group number 2?

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About This Quiz & Worksheet

Get an idea of how much you know about the Cahn-Ingold-Prelog priority rules (CIP) in chemistry. Take this quiz and answer multiple-choice questions on key topics like the term for two chemical compounds with the same chemical formula and atom connectivity but are different in their three-dimensional shape and an atom that would receive priority group number 3.

Quiz & Worksheet Goals

Consider the following for the quiz:

  • Atom that would be labeled as priority group number 2
  • Feature of an atom that CIP priority rules utilize to assign priority groups to atoms within a molecule
  • Substituent that would receive priority group number 1

Skills Practiced

  • Knowledge application - use your knowledge to answer questions about CIP priority rules for priority groups and the feature of an atom these rules utilize to assign groups to atoms within a molecule
  • Information recall - access the knowledge you've gained regarding two chemical compounds with the same chemical formula and atom connectivity but differ in their three-dimensional shape
  • Making connections - use your understanding of chemical substituents and how they're connected to CIP priority rules

Additional Learning

For further insight into priority rules, consider the lesson named Cahn-Ingold-Pregold Priority Rules in Chemistry. These points will be covered in greater detail:

  • Main purpose of CIP priority rules
  • CIP priority rule steps
  • Four different atoms/groups of atoms bonded to stereocenters
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