When 2-methylbut-2-ene undergoes a Wagner-Meerwein rearrangement in the presence of concentrated sulfuric acid, the following mechanism and product are observed:1. Protonation: The double bond of 2-methylbut-2-ene reacts with the concentrated sulfuric acid H2SO4 , resulting in the protonation of the alkene and the formation of a carbocation intermediate.2. Wagner-Meerwein rearrangement: The carbocation intermediate undergoes a 1,2-hydride shift, which is the key step in the Wagner-Meerwein rearrangement. The hydride from the neighboring carbon 3rd carbon moves to the carbocation center 2nd carbon , and the positive charge shifts to the 3rd carbon.3. Deprotonation: The carbocation formed in the previous step is deprotonated by the bisulfate ion HSO4- to regenerate the sulfuric acid catalyst and form the final product.The final product of this reaction is 2-methylbut-1-ene.