Which of the following is a polar compound?

Arrange the following molecules from most to least polar ($I$,$II$,$III$,$IV$,$V$ respectively): $CH_4$,$CF_2Cl_2$,$CF_2H_2$,$CCl_4$,$CCl_2H_2$.

Determine the correct sequence of polarity for the following molecules:
$(1)$ Benzene
$(2)$ Inorganic Benzene $(B_3N_3H_6)$
$(3)$ $PCl_3F_2$
$(4)$ $PCl_2F_3$
(Where $P = \text{polar}$,$NP = \text{non-polar}$)

Which of the following molecules has a net dipole moment of zero?

Give the correct order of initials $T$ or $F$ for the following statements. Use $T$ if the statement is true and $F$ if it is false.
$I. \, (CH_3)_2P(CF_3)_3$ is non-polar and $(CH_3)_3P(CF_3)_2$ is a polar molecule.
$II. \, CH_3 \widehat{P} CH_3$ bond angles are equal in the $(CH_3)_3P(CF_3)_2$ molecule.
$III. \, PF_3$ will be more soluble in a polar solvent than $SiF_4$.

Among the following,the molecule with the highest dipole moment is