Propose a mechanism for each of the following reactions:

a)In this reaction first lone pair of oxygen attacks on hydrogen then oxygen get positive charge and after that water will remove and positive charge is taken by that carbon where oxygen was attached. To form a stable carbocation methyl shift was there then carbon hydrogen will make double bond and ring occupied methyl groups on adjacent carbons.

b) Because of primary carbocation cannot be formed the dehydration is an E2 reaction. The alkene that results is protonated , and the proton that is removed is the one that results in formation of the most stable alkene.

a)

In this reaction first lone pair of oxygen attacks on hydrogen then oxygen get positive charge and after that water will remove and positive charge is taken by that carbon where oxygen was attached. To form a stable carbocation methyl shift was there then carbon hydrogen will make double bond and ring occupied methyl groups on adjacent carbons.

b)

Because of primary carbocation cannot be formed the dehydration is an E2 reaction. The alkene that results is protonated , and the proton that is removed is the one that results in formation of the most stable alkene.