Question

describe rearrangement reaction and give its mechanism

Answer 1

A rearrangement reaction is a broad class of organic reactions where the carbon skeleton of a molecule is rearranged to give a structural isomer of the original molecule.Often a substituent moves from one atom to another atom in the same molecule. In the example below the substituent R moves from carbon atom 1 to carbon atom 2.
Intermolecular rearrangements also take place.
A rearrangement is not well represented by simple and discrete electron transfers