Q. 74.3( 20 Votes )
Describe the shapes of BF3 and BH4–. Assign the hybridization of boron in these species.
Boron-hydride ion (BH4 –) is formed by the sp3 hybridization of boron orbitals. Therefore, it is a tetrahedral structure.
As a result of its small size and high electronegativity, boron tends to form monomeric covalent halides. These halides have a planar triangular geometry. This triangular shape is formed by the overlap of three sp2 hybridized orbitals of boron with the sp orbitals of 3 halogen atoms. Boron is sp2 hybridized in BF3.
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