# IUPAC nomenclature benzene ring and functional group [closed]

What will be the IUPAC name of the benzene ring compound with SO3H and COOH as substituents?

## closed as off-topic by ringo, Todd Minehardt, Jan, M.A.R., WildcatSep 24 '16 at 20:25

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According Section P-41 (seniority order for classes) and in more detail Section P-42 (seniority order for acids) of the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), carboxylic acids $(\ce{-COOH})$ are senior to sulfonic acids $(\ce{-SO2-OH})$. Therefore, a compound that contains both functional groups is named as carboxylic acid. In case of benzenecarboxylic acid $(\ce{C6H5-COOH})$, the retained name ‘benzoic acid’ is the preferred IUPAC name (PIN).