Which of the following arrangements does not represent the correct order of the property stated against it ?

Options

A. `V^(2) lt Cr^(2+) lt Mn^(2+) lt Fe^(2+)` : paramagnetic behaviour
B. `Ni^(2+) lt Co^(2+) lt Fe^(2+) lt Mn^(2+)` : ionic size
C. `Co^(3+) lt Fe^(3+) lt Cr^(3+) lt Sc^(3+)` : stability in aqueous solution.
D. `Sc lt ti lt Cr lt Mn` : number of oxidation states.

Answer

A

Explanation

`V^(2) : 3d^(3) ` : No. of unpaired electrons =3
`Cr^(3+) : 3d^(4)` : No. of unpaired electrons = 4
`Mn^(2+) + 3d^(5)` : NO. of unpaired electrons = 5
`Fe^(2+) : 3d^(6)` : No. of unpaired electrons = 4
`therefore` Correct order of paramagnetic behaviour is `Mn^(2+) gt Fe^(2+) = Cr^(2+) gt V^(2+)`