Which of the following does not represent the correct order of the properties indicated?

Options

A. `Ni^(2+) gt Cr^(2+) gt Fe^(2+) gt Mn^(2+)` (size)
B. `Sc gt Ti gt Cr gt Mn` (size)
C. `Mn^(2+) gt Ni^(2+) gt Co^(2+) gt Fe^(2+)` (unpaired electron)
D. `Fe^(2+) gt Co^(2+) gt Ni^(2+) gt Cu^(2+)` (unpaired electron)

Answer

A

Explanation

In a period on moving from leftto right ionic radii decreases So, the order of cationic radi is
`Cr^(2+) gt Mn^(2+) gt Fe^(2+) gt Ni^(2+)`
In `Sc gt Ti gt Cr gt Mn` (Correct order of atomic radii)
In
Number of unpaired electrons.