Why is ph3 Dispersion and Dipole-Dipole?

Answer 1

PH3 has a dipole moment , of 0.58 D. Therefore there will be dipole dipole interactions. All molecules experience London dispersion forces as these are caused by the interaction of instantaneous dipoles due to the movement of electrons within the molecules.

Answer 2

PH3 (phosphine) exhibits dispersion forces due to temporary fluctuations in electron distribution, resulting in temporary dipoles which attract neighboring molecules. It also has dipole-dipole interactions due to the permanent dipole moment created by the electronegativity difference between phosphorus and hydrogen atoms.