91Ó°ÊÓ

1. Assign the priority order to the groups on the basis of atomic number. Higher the atomic number get highest priority.

2. Double bond is considered as carbon is attached to 2 carbons.

3. Triple bond is considered as carbon is attached to 3 carbons.

4. Lowest priority group is always on dotted line.

5. If lowest priority group is not on dotted line then exchange the group with that group which is on dotted line and to maintain the stability of the com[pound we have to exchange other two compounds also.

6. Then according to priority order we have to determine the configuration. We have to go highest priority order to lowest priority order and if we go clockwise then it is R configuration and if we go anticlockwise then it is S configuration.

1. Select longest parent chain.

2. Functional group has to be given lowest number.

3. If two Functional groups are present then give number according to priority order.

Chiral objects are those objects which have no same mirror images. The mirror images don’t superimpose each other. whose mirror images superimpose each other that compounds are called achiral objects.

Chiral carbon is that carbon atom which is bonded to four different groups.