The question asks which of the listed compounds does NOT contain a carboxylic acid group (- COOH). Citric acid (C₆H₈O₇) contains three - COOH groups. Lactic acid (C₃H₆O₃) contains one - COOH group and one hydroxyl (-OH) group. Tartaric acid (C₄H₆O₆) contains two -COOH groups and two -OH groups. Ascorbic acid (C₆H₈O₆), also known as Vitamin C, is a weak acid, but its acidity primarily arises from enol groups, not carboxylic acid groups. Its structure is based on a lactone ring and does not contain a -COOH functional group.
Which one of the following does NOT contain COOH group ?
Asked in UPSC CAPF 2019 · Topic: Organic Acid (Hydroxy Acids (e.g., Lactic Acid, Citric Acid, Tartaric Acid) and Keto Acids (e.g., Pyruvic Acid))
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