The following transformation involves a carbocation rearrangement. The carbocation is generated by potonation of the hydroxyl group by the lose of water. Which bond has to migrate in the carbocation to yield the product indicated (after the deprotonation) ?

The following transfonnation involves a carbocation rearrangement. The carbocation is generated by protonation of the hydroxyl group, followed by the loss of water. Which bond has to migrate in the carbocation to yield the product indicated (after the deprotonation)

How many 1,2-shifts are involved in the following rearrangement of carbocation?

How many 1,2-shifts are involved in the following rearrangement of carbocation?

Which of the following carbocation can not undergo rearrangement ?

Which of the following carbocation can not undergo rearrangement ?

Which of the following carbocations would not likely rearrange to more stable carbocation ?

Which of the following carbocations would not likely rearrange to more stable carbocation ?

Which of the following reaction mechanism doe not involves carbocation as an intermediate ?