Click the "draw structure" button to launch the drawing utility, and be sure to answer all parts. Devise a synthesis of the epoxide B from alcohol A. a arrow b A B (Hint: Determine what alkene is needed to make the epoxide, and begin the synthesis with a reaction that yields the needed alkene from an elimination reaction.) a [1] arrow draw structure ... [2] darrow b [3] larrow draw structure ... [1]: POCl3 and pyridine H2SO4 and NaH POCl3 pyridine H2SO4 POCl3 and H2SO4 [2]: pyridine and POCl3 H2O pyridine NaH Br2 and H2O BH3 [3]: pyridine POCl3 POCl3 and pyridine POCl3 and H2SO4 NaH H2SO4 and NaH