Which has maximum paramagnetic nature ?

Options

A. `[Cu(H_(2)O)_(4)]^(2+)`
B. `[Cu(NH_(3))_(4)]^(2+)`
C. `[Mn(H_(2)O)_(6)]^(2+)`
D. `[Fe(CN)_(6)]^(4-)`

Answer

C

Explanation

(i) `[Cu(H_(2)O)_(4)]^(+2)Cu^(+2)= 3d^(9)` No. of unpaired
`e^(-)=1`
(ii) `[Cu(NH_(3))_(4)]^(+2) Cu^(+2)=3d^(9)`

No. of unpaired electron =1
(iii) `Mn^(+2)=3d^(5) 4s^(0)` No. of unpaired `e^(-)=5`
(iv) `Fe^(+2)= 3d^(6)`

No. of unpaired electron =0