A. Isotopy
B. Resonance
C. Isomerism
D. Reforming
Correct Answer:
Option B – Resonance
Explanation
Resonance involves two forms of a compound.
Isomerism involves two or more forms of an element.
Reforming involves the rearrangement of molecule.
This deals with a two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.

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