![]() However, if a ketone is present with an alcohol (example 3) then we will use the suffix, “-one” because ketones have a higher priority for nomenclature than alcohols. So in example #1 above, the suffix of the molecule will be “-oic acid”, not “-one”, because carboxylic acids are given higher priority. The functional group with the highest priority will be the one which gives its suffix to the name of the molecule. If you have a molecule with, say, a carboxylic acid and a ketone you consult the table. And so, IUPAC (think of the “Ministry of Magic”, but for chemists) has developed one. We need some kind of priority system for nomenclature. What do you do? What suffix do you give the molecule? But then you come across a molecule which has multiple functional groups. ![]() You’re familiar with the familiar naming suffixes like -ol, -ene, -ane, -oic acid and so on. Let’s say you’re trying to name a molecule. How To Determine Which Functional Group Has “Priority” For Naming Purposes
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