Which one of the following ions is the most stable in aqueous solution ? (At. no. Ti = 22, V = 23, Cr = 24, Mn = 25) (CBSE AIPMT 2007)

In an aqueous solution, water is a weak ligand and it splits degenerated d orbitals into two energy sets: 2g t and g e .the electronic configuration of ions can be written as follows, 3+ 3 0 3 0 2g g Cr (24) 3d 4s t e >> 3+ 2 0 2 0 2g g V (23) 3d 4s t e >> 3+ 1 0 1 0 2g g Ti (22) 3d 4s t e >> Here 2g t are triply degenerated orbitals ( xy yz xz d ,d ,d ) and 3+ 4 0 4 0 2g g Mn (25) 3d 4s t e >> g e are doubly degenerated orbitals 2 2 2 x y z d ,d . We know that half-filled or complexly filled orbits attain the extra stability than incompletely filled orbital. Chromium(III) ion conta