Site Navigation Links


Introduction


Definitions


Three-Dimensional Representations


Assigning Priorities


Determining Stereochemical Relationships


Question Sets


A project of the Chemical Education Digital Library
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.

Click Next to check your answer and continue on.


Back | Next

Assigning Priorities Home