`Fe^(3+)` compounds are more stable than `Fe^(2+)` compounds because

Explanation

The electronic configuration of `Fe^(2+)` and `Fe^(3+)` ions are :
`Fe^(2+) : [Ar]3d^6, Fe^(3+): [Ar]3d^5` .
The electronic configuration of `Fe^(3+)` has half filled subshell and hence it is stable.