The functional group found in citric acid is Carboxylic acid.
The names of carboxylic acids are frequently used to identify them. They frequently end in -ic acid. There are other IUPAC-recommended names; in this system, carboxylic acids are designated by the suffix -oic acid. According to IUPAC standards, butyric acid (C3H7CO2H) is classified as butanoic acid.
Even if there are other substituents, such 3-chloropropanoic acid, the carboxyl can be regarded as position one of the parent chain for the nomenclature of complex compounds having a carboxylic acid. It can also be referred to as a "carboxy" or "carboxylic acid" substituent on a different parent structure, such 2-carboxyfuran.
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