HL оnly 5. (а) Explаin why the first iоnizаtiоn energy of sulfur is lower than that of phosphorus. [2] (b) Deduce the Lewis (electron dot) structure and molecular geometry of sulfur tetrafluoride, SF4, and sulfur dichloride, SCl2. (c) Suggest, giving reasons, the relative volatilities of SCl2 and H2O. [3] (d) Organomagnesium compounds can react with carbonyl compounds. One overall equation is: Deduce the hybridization of the central carbon atom in Compound A. [1]