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For which of the following molecules would the intermolecular forces be due mainly to London forces CH3COCH3 O2 CH3OH SO3 H2S?
Ok let's look at the different molecules: 1. CH3COCH3 is acetone. The molecule is a trigonal planar around the central carbon with the electronegative oxygen pulling electron density towards itself. So this is a polar molecule. 2. O2 is non-polar and relies only on dispersion forces. 3. CH3OH is has hydrogen bonding, dipole-dipole forces, and dispersion forces. 4. SO3 is a trigonal planar molecule with three oxygens around the sulfur, making it non-polar. Therefore it relies only on dispersion forces. 5. H2S is another polar molecule (bent by two lone pairs on the sulfur). So SO3 and O2 are the two molecules relying mainly on dispersion (London) forces.
The intermolecular forces for O2 and H2S would be mainly due to London dispersion forces since they have only nonpolar covalent bonds. CH3OH and SO3 would have additional intermolecular forces due to hydrogen bonding and dipole-dipole interactions. CH3COCH3 would have dipole-dipole interactions as well as London dispersion forces.
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