4.Predict the major product of the following reaction(20) 1个a购9 2)H30* 2Br入OH KOH 3. 「E8r90 PhCH2CI △ 6. EIOH.H" 。 KOH EtOH MesO2CI,EtgN NaCN3 4. Predict the major product of the following reaction (20) Cl 1. EtBr Mg, Et2O 1) 2) H3O+ H O 2. 3. D Br Me3N 4. Br OH KOH 5. H2SO4 6. OH MeSO2Cl, Et3N NaCN 7. O EtOH, H+ 8. Br KOH Mg, Et2O PhCH2Cl OH EtOH