Section IlI: Mechanisms (15 points) Providé à complete meca reactions using arrows to indicate the flow of electrons. If asked, use you mechanism to explain the stereochemical or regiochemical outcome. 6. (a) Provide a step wise mechanism for the following reaction (4 points) 2SO4 ) What would you expect to happen if HBr was used instead of H2SO4 in the above reaction? (1 point) Despite being energetically more stable, why was a 5-membered ring formed instead of the 6-membered ring in the reaction indicated below? (1 point) H3PO4 SH Not Observed Major Product Section IlI: Mechanisms (15 points) Providé à complete meca reactions using arrows to indicate the flow of electrons. If asked, use you mechanism to explain the stereochemical or regiochemical outcome. 6. (a) Provide a step wise mechanism for the following reaction (4 points) 2SO4 ) What would you expect to happen if HBr was used instead of H2SO4 in the above reaction? (1 point) Despite being energetically more stable, why was a 5-membered ring formed instead of the 6-membered ring in the reaction indicated below? (1 point) H3PO4 SH Not Observed Major Product