Question
Wed February 01, 2012 By:

sir what is the basis for the priority of naming functional groups?

Expert Reply
Fri February 03, 2012

 

Functional Group Priorities in Organic Nomenclature 

Group   As a substituent:  
from highest to lowest priority:     examples:
onium ion

   
carboxylic acid



carboxy
 
sulfonic acid



sulfo
 
anhydride

   
ester


alkoxycarbonyl
 
acid chloride


chloroformyl
 
amide



amido or carbamoyl
 
nitrile

cyano

3-cyanopentanoic acid

Group   As a substituent:  
aldehyde


oxo or formyl

4-oxobutanoyl chloride

4-formylcyclohexanecarbonitrile

ketone


oxo

methyl 3-oxopentanoate

alcohol

hydroxy

3-hydroxycyclopentanone

phenol

   
thiol

mercapto  
amine


amino

2-aminophenol

peroxide

peroxo  
organometallic

   
Group   As a substituent:  
alkene


alken or alkenyl

3-butenal

alkyne

alkynyl  
ether

alkoxy

6-methoxy-3-heptene

halogen

halo

4-bromo-2-pentyne

nitro

nitro

2-nitrotoluene

 

 

 

 



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