Respuesta :
Answer: -COOH
Explanation: In general, carboxylic acids are represented by the formula RCOOH, where R is a hydrocarbon group and COOH is the fuctional group.
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The functional group for a carboxylic acid is -COOH.
What is a carboxylic acid?
An organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.
Organic acids such as acetic acid all contain a functional group called a carboxyl group. The carboxyl group contains the C=O. of the carbonyl group, with the carbon atom also being bonded to a hydroxyl (−OH) group. The simplest carboxylic acid is acetic acid [tex](CH_3COOH)[/tex]
Hence, the functional group for a carboxylic acid is -COOH.
Learn more about the carboxylic acid here:
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