Final answer:
The functional group of methanoic acid is COOH, which consists of a carbonyl group (C=O) and a hydroxyl group (-OH).
Explanation:
The functional group of methanoic acid is COOH. In the molecule, the carbon atom is doubly bonded to an oxygen atom (C=O) and also bonded to a hydroxyl group (-OH), which characterizes the carboxylic acid functional group.
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