Chemistry Fundamental Principles of Organic Chemistry ETEA 2022
PMDC Verified Question 45 of 83
The structural isomerism in which isomers are in dynamic equilibrium with each other is:
A
Chain isomerism
B
Position isomerism
C
Metamerism
D
Tautomerism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Tautomerism
Concept:

Tautomerism is a unique form of structural isomerism where isomers readily interconvert and exist in a state of dynamic equilibrium.

Solution:

  • In tautomerism, a rapid shift of a proton and a double bond occurs within the molecule.


  • Because the activation energy for this interconversion is very low, the two forms (e.g., keto and enol forms) exist simultaneously in a solution, constantly converting back and forth (dynamic equilibrium).


Why other options are incorrect:

Chain, position, and metamerism involve stable, isolable compounds that do not spontaneously interconvert under normal conditions.

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