NEET levelSingle correct optionDifficulty 1 of 3st169
Arrange the groups −CHX3, −COOH, −H and −CHX2OH in decreasing CIP priority.
A−CHX2OH > −COOH > −CHX3 > −H
B−COOH > −CHX3 > −CHX2OH > −H
C−COOH > −CHX2OH > −CHX3 > −H
D−CHX2OH > −CHX3 > −COOH > −H
Answer: C
All four groups are attached through carbon (or H), so compare the atoms attached to that carbon. COOH has (O,O,O), CH2OH has (O,H,H), CH3 has (H,H,H) and H is lowest. The order is COOH > CH2OH > CH3 > H.