Bonding in coordination compounds are explained using many theories for e.g 1. Werner's theory 2.V.B.T which takes into account concept of hybridization,secondly it considers magnatic criteria of bond type but i stress it was limitation of V.B.T that it could not talk abt strong or weak ligands so following V.B.T[ Mn(CN)6] -3 .Mn (+3)is not as paramagnetic (but not diamagnetic)as expected so pairing takes place now as 6 ligands are there we need 6 vacant hybrid orbitals so hyb is d2sp3 i.e it is an inner orbital complex . 3. Crystal field theory considers a metal &ligand as point charges, d orbital splits into 2 set of orbitals t2g &eg t2g consists of dxy ,dxz dyz that means 3 degenerate obitals ,eg consists of dz2 dx2-y2 .There is energy gap bet t2g &eg called as Dq now following C.F.T also in ur case6 CN ligands splits into 2 sets as mentioned earlier but Dq will be large as CN is a strong ligandso 4 electrons are forced to remain in t2g orbitals & if we fill 3 degenerate orbitals first each will get 1 electron & only1 will pair up following HUND'S RULE OF MAX MULTIPLICITY
E-Store
hybridization in [Mn(CN)6]3-
