(B) In $(SiH_3)_3N$,the nitrogen atom has a lone pair of electrons.Silicon has vacant $3d$ orbitals.The lone pair on nitrogen is donated into the vaca

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(B) In $(SiH_3)_3N$,the nitrogen atom has a lone pair of electrons.Silicon has vacant $3d$ orbitals.The lone pair on nitrogen is donated into the vacant $d$ orbital of silicon,forming a $p\pi-d\pi$ back bond.Due to this back bonding,the nitrogen atom undergoes $sp^2$ hybridization and adopts a planar geometry.