Which of the following complex compounds will exhibit highest paramagnetic behaviour -

Options

A. `[Ti(NH_(3))_(6)]^(3+)`
B. `[Cr(NH_(3))_(6)]^(3+)`
C. `[Co(NH_(3))_(6)]^(3+)`
D. `[Zn(NH_(3))_(6)]^(2+)`

Answer

B

Explanation

`Ti^(3+)rarr3d^(1)rarr" unpaired electrons "=1, mu=1.73BM`
`Cr^(3+) rarr 3d^(3)4s^(2)rarr" unpaired electrons "=3, mu=3.87BM`
`Co^(3+)rarr3d^(6)rarr" unpaired electrons "=0, mu=0BM`
`Zn^(2+) rarr 3d^(10) rarr" unpaired electrons "=0,mu=0BM`