Sequence rules for R and S nomenclature

Sequence rules give the ranking order for the groups attached to chiral carbon in order to assign R or S configuration to that carbon. Mainly three sequence rules are defined to rank the groups in priority order.
0:00 Introduction
0:14 Why they are required?
0:54 Sequence rule 1
1:58 Example 2
4:50 Sequence rule 2
6:33 Example 3
8:46 Sequence rule 3
9:34 Example 5