Provide a detailed curved-arrow mechanism for the following reaction. Step B is the faster step. Briefly explain your choice of faster step. The rate of these steps is related to the stability of the carbocations products. Step A involves a secondary vinylic carbocation, whereas step B involves a secondary carbocation that has resonance stabilization.
B is faster.
Provide the major organic product of each reaction. Please do not include mechanisms. Provide a mechanism that shows how the major product is formed. Very briefly explain your choice of rate determining step. The relative rates of mechanism steps is determined by the relative magnitudes of the energies of activation.