Explanation:

Ascorbic acid is an organic compound with chemical formula C6H8O6 or HC6H7O6. Hence, it does not contain any carboxylic acid functional group. Ascorbic acid, known initially as hexuronic acid. It is a white solid, however impure samples may appear yellowish. It dissolves well in water to give a mildly acidic solutions. It is a mild reducing agent. The functional group COOH corresponds to a carboxylic acid. • The chemical formula of Lactic acid is C3H6O3 or CH3CHOHCOOH. Hence, it also contains a carboxylic acid functional group. • The chemical formula of Tartaric acid is C4H6O6 or COOH(CHOH)2COOH. Hence, it also contains a carboxylic acid functional group. • The chemical formula of Citric acid is C6H8O7 or CH2COOHC(OH)COOH-CH2COOH. Hence, it also contains a carboxylic acid functional group.