Answer Posted / vijay
As said by Tanveer and Lisa they r correct.But the RS notation depends on CIP rules
The rules r
1.To attain RS notation it should be chiral carbon, means all the four groups attached to the carbon should be different.
2.The lowest priority should be taken backside in wedge method and vertically in fisher method. For example in H,O,C and methyl group, 'H' is taken as lowest priority.
3.The atoms attached to the chiral carbon should be given priority 1 2 3 4 based on highest atomic number.As example given by Tanveer.
4.In case of methyl and ethyl the priority should be given to ethyl first.
5.In case of single,double and triple bonds the priority should be given in this manner triple>double>single.
For example methyl and COOH , COOH is given as first priority.
6.RS notation doesn't accounts on optical activites of a compound.
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