need some help would appreciate full explanation

1. Draw the major expected organic product for the following reaction: 2. Fill in the missing reagents necessary to perform each transformation below. In the case of sequential steps, be sure to include proper numbering! 3. Draw the major organic product expected as a result of the following multi-step synthesis: 1) BH3 - THF 2) H2O2,NaOH 3) PBr3 4) Mg,Et2O 5) O 6) H2O 7) Na2Cr2O7 H2SO4