Final answer:
The functional group of a fatty acid is a carboxyl group, which is essential for the properties and functions of fatty acids.
Explanation:
The functional group of a fatty acid is a carboxyl group. A carboxyl group consists of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-COOH). This group is found at the end of a fatty acid carbon chain.
In organic compounds, the carboxyl group is characteristic of carboxylic acids, including fatty acids. It provides acidic properties to these molecules, influencing their chemical behavior and reactions. The presence of a carboxyl group is vital in the structure and function of fatty acids.
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