## Introductory Chemistry (5th Edition)

a. $NCl_{3}$ is a polar molecule, hence it has dispersion, dipole-dipole forces, and hydrogen bonds. b. $NH_{3}$ is a polar molecule, hence it has dispersion, dipole-dipole forces, and hydrogen bonds. c. $SiH_{4}$ has a tetrahedral geometry; because of this all the polar forces cancel away so only dispersion forces exist. d. $CCl_{4}$ has a tetrahedral geometry, and because of this all the polar forces cancel away so only dispersion forces exist.