Dipole moment of PCl3F2 and P(CH3)3(CF)2 molecules are zero while dipole moment of PCl2F3 and P(CH3)2(CF3)3 are non zero why?

According to bent rule more electronegative atom or group attached those hybrids orbital have minimum S- character.

There is in trigonal bipiramidal (TBP) Geometry we known that axial orbital hare no s-character so F and -CF₃ group are attached with equatorial positions.  Hence dipole moment of P(CH₃)₂(CF₃)₂  is zero. While in case of PCl₂F₃ and P(CH₃)₂(CF)₃ molecules one of the F and –CF₃ group are also present at equatorial position hence there is net dipole moment.

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Dipole moment of PCl3F2 molecule is zero while dipole moment of PCl2F3 molecule is non zero why?

Dipole moment of P(CH3)2(CF3)2 molecule is zero while dipole moment of P(CH3)2(CF)3 molecule is non zero why?