please help with all of these thank you i would appreciate so much

(3) Predict the product for each of the following: a) 3)2)Na2Cr1O7,H2SO4,H2O 4) H2O 4) Et MgBr 5) H2O c) 1) EtMgBr 2) H2O 3) Na2(C2O7,H2SO4,H2O 4) Et MgBr 5) H2O c) d) 1) 50Cl2 2) 3eq NaOt 4) 2 eq NaNH2 in NH3 b) H2/ lindlars Catalys e) i)Brr2andlightKOBu 3) BH3 4) H2O2/NaOH 5) PCC