The crystal field splitting energy for octahedral ( ) and tetrahedral ( t ) complexes is related as (a) t (b) t (c) t (d) t

Splitting of tetrahedral complex is 2 rd 3 of octahedral complex, So, for one ligand splitting in octahedral is o Δ 6 ,then for one ligand splitting in tetrahedral is 2 3 6 o , so for 4 ligands. 2 4 3 6 x x o t = 4 9 o Hence, the correct option is (b).