-COOH
An organic acid is an organic compound with acidic properties. The most common organic acids are the carboxylic acids, whose acidity is associated with their carboxyl group –COOH
Answer:
–COOH
Explanation:
The function group of an organic acid is –COOH
For example, acetic acid CH₃COOH has -COOH functional group.
-CHO is a functional group called aldehyde.
-OCO is a functional group called ester.
