Assigning CIP Notation 1

Choose a problem from the menu below; its structural formula will be displayed in the drawing window automatically. If the structure has a stereogenic center, assign the configuration as R or S. If the structure is achiral, check that button. To evaluate your answer click the Check Answer button; numbers indicating the CIP priority order of substituents at the stereogenic center will be displayed (1 = highest priority, 4 = lowest).