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

According to bent rule more electronegative atom or group attached those orbital have minimum S- character there is in trigonal bipiramidal (TBP) Geometry we known that axial orbital hare no S- character so -CFgroup is  attached with axial positions.  Hence dipole moment of P(CH3)2(CF3)2  is zero.
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