The complex ion having minimum magnitude of Δ0(CFSE) is :
Arrange the following complex ions in increasing order of crystal field splitting energy △0. [Cr(Cl)6]3−,[Cr(CN)6]3−,[Cr(NH3)6]3+
Indicate the complex ion which shows geometrical isomerism. (a) [Cr(H2O)4Cl2]+ (b) [Pt(NH3)3Cl] (c) [Co(NH3)6]3+ (d) [Co(CN)5(NC)]3−