Question

What is the prefix used for functional group aldehyde ?

• A. -al
• B. - ol
• C. formyl
• D. hydroxy

Answer 1

The Correct Option is C

To solve the problem, we need to determine the correct prefix used for the aldehyde functional group in IUPAC nomenclature.

1. Understanding Functional Group Naming:
- The aldehyde group is represented as $-CHO$ in organic chemistry.
- In IUPAC naming:
 • The suffix used is -al (e.g., ethanal, methanal)
 • The prefix used when the aldehyde is not the principal functional group is formyl

2. Evaluating the Options:
- (1) -al → suffix
- (2) -ol → suffix for alcohols
- (3) formyl → ✅ correct prefix for aldehydes
- (4) hydroxy → prefix for alcohols

Final Answer:
The prefix used for the aldehyde functional group is formyl.