Intermolecular Forces III Rank the compounds below from the substance that has the strongest intermolecular forces to the substance with the weakest. A CH3OCH3 B HClO C FePO4 D Cu E NH4I F SO3 Strongest 1__C__ 2__E_ 3__D__ 4__B__ 5__A__ 6_F___ Weakest Explain your reasoning below. This should include the identity of the strongest intermolecular force (IMF) in each compound. Include also Lewis structure or ion formula, as appropriate. The skeletal structure of an organic compound follows the way the formula is written HClO is an oxyacid with a Lewis structure of The Lewis . Because of resonance, all oxygens are equal and the structure of SO3 is molecule is nonpolar. The ions that make up “C” are Fe3+ and PO43- (from the memorized formula of phosphate). The ions that make up “E” are NH4+ and I-. Ammonium is a common polyatomic ion. Ionic compounds have the highest IMF. The highest charges on iron(III) phosphate make that stronger than ammonium iodide. Next is the metallic bonds/IMF of copper. Copper is followed by the hydrogen bonding in hypochlorous acid. The bend structure around the oxygen of the organic compound makes it polar, so it has dipole-dipole forces. Not polar sulfur trioxide has only dispersion forces and is the weakest.