According to Cahn-Ingold-Prelog sequence rules, the correct order of priority for the given groups is

Options

A. ` - COOHgt -CH_(2)OHgt -OH gt - CHO`
B. `- COOH gt -CHOgt -CH_(2)OH gt -OH`
C. ` - OHgt -CH_(2)OHgt -CHOgt - COOH`
D. `-OH-COOH gt - CHO gt -CH_(2)OH `

Answer

D

Explanation

Cahin - Ingold - Prelog priority rule, states that the priority of groups is set by the atomic number of their atoms. The atom of a group with higher atomic number, has higher priority. Groups with atoms of equivalent atomic number having double or triple bond, have high priority than those having single bond.
Therefore the correct order of priority is
- OH 2 -COOH3-CHOP-`CH_(2)`OH,