Question

Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly=glycine, en=ethylenediamine and bipy =bipyridyl
(At. no. `Ti=22, V=23, Fe=26, Co=27`)
A. (a) `[Ti(NH_3)_6]^(3+)`
B. (b) `[Fe(en)(bpy)(NH_3)_2]^(2+)`
C. (c) `[Co(OX)_2(OH)_2]^(-)`
D. (d) `[V(gly)_2(OH)_2(NH_3)_2]^(+)`

Answer 1

Correct Answer - A
`Fe^(2+)`, `Co^(5+)`, `Ti^(3+)` and `V^(3+)` have 4, 4, 1, 2 unpaired electrons respectively. The pairing leads `Fe^(2+)` with no unpaired electron.