Coordination CompoundHard

Question

The d-electron cnfiguration of Cr2+ , Mn2+ , Fe2+ and Co2+ are d4 , d5 , d6 and d7 respectively. Which one of the following will exhibit minimum paramagnatic behaviour ?
.(At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Options

A.[ Fe ( H2O)6 ]2+
B.[ Co ( H2O)6 ]2+
C.[ Cr ( H2O)6 ]2+
D.[ Mn ( H2O)6 ]2+

Solution

Cr2+       :   d4
Mn2+       :   d5
Fe2+       :   d6
Co2+       :   d7
∴ [ Co ( H2O)6 ]2+ has minimum number of unpaired electrons and thus, minimum paramagnetic behaviour.

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