Which of the following groups is/are always taken as a substituent in IUPAC nomenclature of organic compounds?
−NH2
-R or alkyl group
(−O||C−O−O||C−)
−NO2
a & c are not always treated as substituents!
b & d are always (No exceptions) treated as substituents
In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered as: