The correct sequence for polarity of the following molecule :

(1) Benzene (2) Inorganic Benzene

(3) ${\mathrm{PCl}}_3{\mathrm{F}}_2$ (4) ${\mathrm{PCl}}_2{\mathrm{F}}_3$

(P stands for polar and NP stands for non-polar)

Inorganic Benzene has the chemical formula ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$ and is a colourless liquid. The electron configuration of these cyclic compounds is such that they have alternate B=N bonds, similar to the C=C bonds in benzene, with a H attached to each N and B. Therefore, borazole is entirely a non-polar compound.

Hence, the correct answer is B.