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.
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.
Why Bond length
of O-O is greater in H2O2 than O2F2?
How to arrange
increasing (C-H) bond length in increasing order and H-C-F bond angle in the
given compounds, CH4, CH3F, CH2F2 and CHF3 ?
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?
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