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Monday, January 18, 2021

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?

 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 P(CH3)2(CF3)molecule. we known that axial orbital (pd) have no s-character so –CF3  groups are attached with axial positions while –CH3 groups attach with equatorial (Sp2) position. Hence net dipole moment becomes zero. While in case of P(CH3)2(CF)3 molecule one of the –CF3 group 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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