Rearrangement reactions are one of the important class of organic reactions, wherein a group or bond attached to a carbon atom moves to another carbon atom often in a single molecule.
Example: A-B-X → B-A-X
In rearrangement reactions, the reaction may involve more than one step. No by-products would be formed, and products would be only the structural isomers of the initial reactant.
In intermolecular rearrangement mechanism, migrating group gets completely detached from the molecule and later on gets attached, whereas, in intramolecular one, the migrating group never gets detached completely.
Mechanism: Intermolecular Rearrangement Reactions
Mechanism: Intramolecular Rearrangement Reactions