Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

All three names are used for tautomerism. It is called dynamic isomerism (van't Hoff's name, because the isomers interconvert rapidly), protropy (because the migrating particle is a proton in the common cases such as keto-enol), and kryptomerism (because the individual forms usually cannot be isolated - the 'hidden' isomers). Hence (D), all of the above.