MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsPrevious Year Questions
Which of the following complexes exhibit the highest paramagnetic behaviour? (where, gly = glycine, en = ethylenediammine and bpy = bipyridyl moities) (At. no : Ti = 22, V = 23, Fe = 26, Co = 27) [CBSE AIPMT 2008]
A.[V (gly)2 (OH)2 (NH3)2]
B.[Fe(en) (bpy) (NH3)2]
C.[Co(ox)2 (OH)2]✓ Correct
D.[Ti(NH3)6]
Explanation
In the complex - 2 2 [Co(ox) (OH) ] the oxidation state of Co is +5 and electronic configuration is +5 4 Co =[Ar],3d . +3 3 6 [Ti(NH ) ] the oxidation state of Ti is +3 and electronic configuration is +3 1 Ti =[Ar],3d +2 3 2 [Fe(en)(bpy)(NH ) ] the oxidation state of Fe is +2 and electronic configuration is + 2 2 3 2 [V(gly) (OH) (NH ) ] the oxidation state of V is +5 and electronic configuration is 5 0 0 [ ]4 ,3 V Ar s d Hence, the complex - 2 2 [Co(ox) (OH) ] has maximum number of unpaired electrons thus it shows maximum paramagnitism. Therefore the correct option is (c). COORDINATION C
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