Question

....................... is the functional group of carboxylic acid.

• A. \(-COOH\)
• B. \(-CO-\)
• C. \(-CHO-\)
• D. \(-OH\)

Hint:

The carboxyl functional group (\(-COOH\)) is characteristic of carboxylic acids. It consists of both a carbonyl (\(-C=O\)) and hydroxyl (\(-OH\)) group attached to the same carbon atom.

Answer 1

The Correct Option is A

Step 1: Understanding functional groups
A functional group is a specific group of atoms within a molecule that is responsible for the characteristic chemical reactions of that molecule. Step 2: Identifying the functional group of carboxylic acids
Carboxylic acids are organic compounds that contain the carboxyl functional group (\(-COOH\)). This group consists of a carbonyl (\(-C=O\)) and a hydroxyl (\(-OH\)) group attached to the same carbon atom. Step 3: Evaluating the given options
- \(-COOH\) is the correct answer since it is the carboxyl functional group.
- \(-CO-\) represents a carbonyl group, found in ketones but not exclusive to carboxylic acids.
- \(-CHO-\) represents an aldehyde functional group, not carboxyl.
- \(-OH\) represents a hydroxyl group, found in alcohols but not the defining functional group of carboxylic acids.
Thus, the correct answer is \(\mathbf{-COOH}\).