3. [5 pts] In the event that a carbocation intermediate is formed in one of the intermediate steps of a reaction, what allows scientists to directly observe and isolate them? 4. [10 pts] Give three (3) organic compounds that could generate a stable leaving group. Show the mechanism of which the leaving group is liberated. 5. [10 pts] The following order of reactivity is observed when the following alkenes are subjected to acid-catalyzed hydration: (CH3)2C=CH2CH3CH=CH2 CH2=CH2 Explain this order of reactivity.