Question

identify the intermolecular forces present in each of these substances HCN, C2H6, C6H14, C6H5OH

dispersion forces, dipole-dipole forces, and hydrogen bonding.

Answer 1

The 3 types of intermolecular forces of attraction:

1. London dispersion or Van der Waals forces
2. Dipole-dipole
3. Hydrogen bonding

With hydrogen bonding the strongest of all 3.

1. London dispersion ONLY occurs in nonpolar molecules. It is the weakest of all 3.

2. Dipole-dipole occurs between polar molecules and is stronger than London dispersion but weaker than hydrogen bonding.

3. Hydrogen bonding occurs ONLY in compounds with hydrogen DIRECTLY bonded to O, N, F.

HCN - dipole-dipole, London-dispersion

C2H6 - London dispersion

C6H14 - London dispersion

C6H5OH - Hydrogen bonding, dipole- dipole , London dispersion