Answer
(a) Benzene is nonpolar and thus has only dispersion forces.
(b) $CH_{3}Cl$ is a polar molecule and thus has dipole-dipole and dispersion forces.
(c) $PF_{3}$ is a polar molecule and thus has dipole-dipole and dispersion forces.
(d) NaCl is an ionic compund and thus has ion-ion and dispersion forces.
(e) $CS_{2}$ is a non-polar molecule and thus has only dispersion forces.
Work Step by Step
(a) Benzene is nonpolar and thus has only dispersion forces.
(b) $CH_{3}Cl$ is a polar molecule and thus has dipole-dipole and dispersion forces.
(c) $PF_{3}$ is a polar molecule and thus has dipole-dipole and dispersion forces.
(d) NaCl is an ionic compund and thus has ion-ion and dispersion forces.
(e) $CS_{2}$ is a non-polar molecule and thus has only dispersion forces.