Question

As per IUPAC rules, which of the following groups will be regarded as the principal functional group when present with others?

• A. $-C\equiv C-$
• B. $-OH$
• C. $-\underset{\underset{O}{||}}{C}-$
• D. $-\underset{\underset{O}{||}}{C}-H$

Answer 1

The correct option is D $-\underset{\underset{O}{||}}{C}-H$

$-CHO$ group has a higher priority than all the other groups mentioned. Hence, it becomes the principal functional group.