The Polar molecules are
PCl2F3
Benzene is a symmetrical molecule and no net polarity.
Inorganic benzene is also called Borazine (BH)3 (NH)3 Which is polar.
Compounds (3) and (4) have trigonal bipyramidal structure [Forom VSEPR]
From this symmetry, net dipole moment is zero ⇒ non - polar
μP−Cl ≠ μP−F
So, net dipole moment is non-zero ⇒ polar molecular