According to bent’s rule more electronegative atom or group attached those hybrids orbital have minimum s-character.
There is sp3d (Sp2+pd) hybridization trigonal bipiramidal(TBP) geometry in PCl3F2 molecule. we known that axial orbital (pd) have no s-character so F atoms are attached with axial positions while chlorine atoms attach with equatorial (Sp2) position. Hence net dipole moment becomes zero. While in case of PCl2F3 one of the fluorine atom is also present at equatorial position hence there is net dipole moment.
Related Questions:
What is Bent’s rule of hybridization?
Which of the following compound have longest (S=O)bond length , O=SF2, O=SCl2, O=SBr2.
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