isomère de fonction

OBS: Isomérie de fonction. (...) l'isomérie de fonction (...) se rencontre lorsque les molécules renferment des groupes fonctionnels différents par exemple le groupe COOH de l'acide acétique CH[indice 3] - COOH et le groupe COOCH[indice 3] du formiate de méthyle HCOOCH[indice 3].

CONT: Functional isomers ... differ in functional group, that is, the group (or groups) most material in determining chemical behavior.
CONT: Functional isomerism. Functional isomerism is a type of isomerism in which the difference is not (necessarily) in the position of the atoms, but also in their valence, or chemical nature, or both; in short, in the functional groups present.