Question

As per IUPAC rules, which one of the following groups, will be regarded as the principal functional group?

• A. $-C\equiv C-$
• B. $-OH$
• C. $-CN$
• D. $-COOH$

Answer 1

The correct option is D $-COOH$

As per IUPAC rules, out of the following groups, $-COOH$ will be regarded as the principal functional group.
The order of priority for choosing the principal functional group is $-COOH>-CN>-OH>-C\equiv C-$.