The priority order for R/S nomenclature is

Question

Quizplus · Accepted Answer

The priority order in R/S nomenclature is determined by atomic number, with higher atomic numbers receiving higher priority. The -OH group has the highest priority due to the presence of oxygen. The -CH=CH2 group comes next because the double bond to carbon is treated as if the carbon is bonded to two additional carbons (C=C is equivalent to C-C-C for priority purposes). The -CH2CH3 group has lower priority than the -CH=CH2 because it is treated as a single bond to carbon. The -CH3 group has the lowest priority because it is bonded to the least number of atoms with high atomic numbers.

The Priority Order for R/S Nomenclature Is