13. What type(s) of intermolecular forces exist between the following pairs: (a) HBr and H2S, (b) Cl2 and CBr4, (c) I2 and nitrate, (d) NH3 and C6H6:
a) Dipole-dipole in addition to dispersion
b) Induced dipole - induced dipole
c) Ion - Induced dipole in addition to dispersion