Which of the following lists the substituents in the order of priority, from highest (priority 1) to lowest (priority 4)?

Question

Quizplus · Accepted Answer

The priority order for substituents is based on the atomic number of the atoms directly attached to the main chain. The higher the atomic number, the higher the priority. In choice D, we have -NH₂, -COOH, -C(=O)H, -CH₃. Nitrogen (atomic number 7) has higher priority than carbon (atomic number 6), which is higher than hydrogen (atomic number 1). The carboxylic acid functional group (-COOH) has higher priority than the carbonyl group (-C(=O)H) and the alkyl group (-CH₃). Therefore, the order of priority is -COOH > -NH₂ > -C(=O)H > -CH₃.

Which of the Following Lists the Substituents in the Order