R S Configuration Assigning Priorities

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The discussion focuses on the order of priority for various functional groups in organic chemistry, specifically the ranking of OCOCH3, NH2, COOCH3, COOH, COCH3, and C6H6. Participants seek clarification on how these priorities are determined, particularly regarding the selection of carbon atoms in C6H6 (benzene). One participant suggests that C6H6 should actually be represented as C6H5 when considering its priority as an attached benzene group. The explanation provided indicates that when assigning priorities, double bonds are treated similarly to alkanes, meaning that a carbon in benzene, which is bonded to three other carbons, is prioritized over a carbon in a t-butyl group, which is bonded to three hydrogens. This method of evaluating the connectivity and the types of atoms bonded to the carbon atoms is crucial for determining the correct order of priority among the functional groups.
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The Order of priority of few elements is given Below

OCOCH3 > NH2 > COOCH3 > COOH > COCH3 > C6H6

Can anyone explain me how these priority were assigned.

If we consider C6H6 ...out of the 6 Carbon Atoms which one should i choose ... and if i choose anyone of the Six then i should add their Atomic Numbers of the neighbouring elements and then find out the Largest and that would have the highest Priority. I tried this method with all the atoms but couldn't understand .What approach should i take.

Please Explain me atleast 3 of the above mentioned compounds so that i can get an idea of how to go about it.
 
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Nitin_Naudiya said:
The Order of priority of few elements is given Below

OCOCH3 > NH2 > COOCH3 > COOH > COCH3 > C6H6

Can anyone explain me how these priority were assigned.

If we consider C6H6 ...out of the 6 Carbon Atoms which one should i choose ... and if i choose anyone of the Six then i should add their Atomic Numbers of the neighbouring elements and then find out the Largest and that would have the highest Priority. I tried this method with all the atoms but couldn't understand .What approach should i take.

Please Explain me atleast 3 of the above mentioned compounds so that i can get an idea of how to go about it.
I think the C6H6 is an error and should actually be -C6H5... that is if you are determining the priority of an attached benzene group.
 
Yes it is C6H5

Sorry for the Error
 
Well, that answers the following.
If we consider C6H6 ...out of the 6 Carbon Atoms which one should i choose...

When assigning priorities, you count double bonds the same way you do for alkanes. So for benzene you would consider the attached group as a carbon attached to three other carbons in the same way that a tertiary carbon of an alkane is attached to three other carbons. If you were to rank benzene against t-butyl, you would choose benzene as higher ranking than t-butyl because the methyl groups of t-butyl are of lower rank (carbon attached to three hydrogens) than the adjacent carbons in the benzene ring (carbon attached to one hydrogen and two carbons).
 

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