Which of the following is not correct order regarding the property indicated?

Options

A. `Sc^(3+) lt Cr^(3+) lt Fe^(3+) lt Mn^(3+)- " ionic " " radius "`
B. `Sc lt Ti lt Mn lt Cr` - number of unpaired electrons
C. `Mn^(2+) gt Fe^(2+) gt Co^(2+) gt Ni^(2+)` - spin only magnetic moments
D. `BeO lt MgO lt CaO lt BaO` - basic nature

Answer

A