Which one of the following high-spin complexes has the largest CFSE (Crystal Field stabilization energy ) ?

Options

A. `[Mn(H_(2)O)_(6)]^(2+)`
B. `[Cr(H_(2)O_(6))]^(2+)`
C. `[Mn(H_(2)O)_(6)]^(3+)`
D. `[Cr(H_(2)O_(6))]^(3+)`

Answer

D

Explanation

`Cr^(3+) implies d^(3) , t_(2 g)^(1,1,1) eg^(0, 0 ) , Mn^(3+) implies d^(4), t_(2 g )^(1 ,1,1) eg^(1, 0)`
`CFSE = -1.2 Delta_(0) , " " CFSE = -1.2 Delta_(0) + 0.6 Delta_(0)`
=`-0.6 Delta_(0)`