First slide

Aplicaitons of VBT

Question

Valence bond theory explained the geometries of complexes with the help of hybridization. Hybridization of central atom is ${sp}^{3} d^{2}$ in

Moderate

A

${[{FeF}_{6}]}^{- 3}$
B

${[Co {({NH}_{3})}_{6}]}^{+ 3}$
C

${[Mn {(CN)}_{6}]}^{- 3}$
D

${[Cr {({NO}_{2})}_{6}]}^{- 3}$

Solution

${[Co {({NH}_{3})}_{6}]}^{+ 3}$ , ${[Mn {(CN)}_{6}]}^{- 3}$ , ${[Cr {({NO}_{2})}_{6}]}^{- 3}$ … strong field ligands … $d^{2} {sp}^{3}$ …..
moreover ${Cr}^{+ 3} (d^{3})$ always forms inner orbital octahedral complexes irrespective of the strength of ligands involved.
${[{FeF}_{6}]}^{- 3}$ ….. weak field ligand … ${sp}^{3} d^{2}$

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