R-S configuration or Cahn-Ingold-Prelog configuration [closed]








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How to assign R and S configurations in alkenes and more complicated structures ?


I know that the groups attached to the sp3 hybridized carbon is first prioritized by atomic number then we see the next set of atoms in the unassigned groups.


But it is said that groups containing double or triple bonds are assigned priorities as if they are duplicated or triplicated. What does this means ?




Duplicated means that if there is double bond between say C and O then consider that two O are linked to C through single bond and with that O two C are linked to it each.
The following figure will help more.
![enter image description here](https://i.stack.imgur.com/GZndI.png)


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