Question

The decreasing order of priority for the following functional groups in the IUPAC Nomenclature is: –SO\textsubscript{3}H, –CN, –COOH, –OH, –CHO

• A. –COOH > –SO\textsubscript{3}H > –CN > –CHO > –OH
• B. –SO\textsubscript{3}H > –COOH > –CN > –CHO > –OH
• C. –COOH > –SO\textsubscript{3}H > –CHO > –CN > –OH
• D. –SO\textsubscript{3}H > –COOH > –CHO > –CN > –OH

Hint:

Memorize the priority order of functional groups in IUPAC: –COOH>–SO\textsubscript{3}H>–CN>–CHO>–OH for accurate naming.

Answer 1

The Correct Option is A

In IUPAC nomenclature, the priority of functional groups is determined by their oxidation state and chemical behavior. The order of decreasing priority is: carboxylic acid (–COOH) > sulfonic acid (–SO\textsubscript{3}H)>nitrile (–CN) > aldehyde (–CHO)>alcohol (–OH). This is crucial for naming the parent chain in complex compounds.