# Confusion about prioritizing functional groups in case of poly functional organic compounds

According to Wikipedia, sulfonic acid $$(\ce{-SO3H})$$ is comparatively stronger than carboxylic acid $$(\ce{-COOH})$$.

Then why is sulfonic acid lower in priority than carboxylic acid (while naming poly functional organic compounds) in this priority chart? Even my textbook prioritizes $$(\ce{-COOH})$$ over $$(\ce{-SO3H})$$.

Or is the strength not the only factor while assigning priority?

Correct me if I'm wrong or missing something. I'm currently learning about IUPAC nomenclature.

• Acidity has no relation to nomenclature. – orthocresol Jan 14 '19 at 11:21
• Then why does -cooh get priority over -so3h? – user8718165 Jan 14 '19 at 11:32
• Because IUPAC published a book that says so. There is not much more to it than that... – orthocresol Jan 14 '19 at 11:56
• Did they do it just as such without any justification? – user8718165 Jan 14 '19 at 12:27
• Yes, pretty much. – orthocresol Jan 14 '19 at 12:29