Multiple choice

Which of the following options is the carboxylic acid group?

  1. -COO

  2. -COOH

  3. -OH

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The carboxylic acid functional group is -COOH, consisting of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom. Option A (-COO) represents a carboxylate ion, option C (-OH) is just a hydroxyl group, and option D is incorrect since option B is valid.

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