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.

  • 2
    $\begingroup$ Acidity has no relation to nomenclature. $\endgroup$ Jan 14, 2019 at 11:21
  • $\begingroup$ Then why does -cooh get priority over -so3h? $\endgroup$ Jan 14, 2019 at 11:32
  • $\begingroup$ Because IUPAC published a book that says so. There is not much more to it than that... $\endgroup$ Jan 14, 2019 at 11:56
  • $\begingroup$ Did they do it just as such without any justification? $\endgroup$ Jan 14, 2019 at 12:27
  • $\begingroup$ Yes, pretty much. $\endgroup$ Jan 14, 2019 at 12:29


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