A) Draw the structure of the major product that is formed when propyne undergoes a reaction with HBr in the presence of H2O2.
B) Draw the structure of the product that is formed when but-1-yne is treated with the following reagents:
1) disiamylborane; 2) H2O2, KOH; 3) LiAlH4. Disiamylborane = [(i-Pr)(CH3)CH]2BH, a hindered derivative of BH3.