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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

Question Sets

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Assigning Priorities: Priority Rules

When assigning priority to a double bond, only the two groups coming off the bond should be considered. The atoms on the double bond itself should not be assigned a priority. For example, consider the molecule below.

The atom marked with an asterisk (*) is double-bonded to a carbon, colored in red. This carbon is not assigned a priority; only the chlorine and the hydrogen should be assigned priorities.

Assign priorities, 1 and 2, to the groups on the carbon marked with an asterisk.

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