The compound that is carboxylic acid is highlighted in the image attached.
Carboxylic acid, any of a category of natural compounds wherein a carbon (C) atom is bonded to an oxygen (O) atom with the aid of using a double bond and to a hydroxyl group (―OH) with the aid of using a unmarried bond. A fourth bond hyperlinks the carbon atom to a hydrogen (H) atom or to a few different univalent combining group. Some not unusual place examples of carboxylic acids consist of acetic acid (a element of vinegar) and Formic acid.
Thus, the carboxylic acid is highlighted in the image attached.
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