PS2.4. Write the formula draw a complete Lewis structure and list all of the intermolecular attractive forces or type of bond for each of the following substances. Indicate the most important attractive force that must be overcome when each of the substances is melted. a) methanol(s) b) carbon tetrachloride(s) c) hydrogen cyanide(s) d) potassium iodide(s) e) butane(s) PS2.5. For each of the following pairs of substances predict which will have the highest boiling point and indicate why. A complete answer must include a discussion of both substances. a) CO2(l) and CS2(l) b) CH3NH2(l) and H2NNH2(l) c) HCl(l) and MgCl2(l) d) C7H16(l) and C2H6(l) PS2.6. The compound NH2CH2CH2CH2NH2(l) exhibits intermolecular hydrogen bonding and intramolecular hydrogen bonding. Use Lewis structure drawings to depict each type of hydrogen-bonding.