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QAIPMT-2008-Ch-2222: NEET 2008 Chemistry - Class 12 AIPMT-2008-Ch-2222 Solution: Which of the following complexes exhibits the highest…
Which of the following complexes exhibits the highest paramagnetic behaviour? where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties. (At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)
Multiple Choice Options
- A
- B
- C
- D
Step-by-Step Verified Solution
In [Co( ox ) 2 (OH) 2 ] _
Co +5 = [Ar] 3d 4 (4 unpaired electrons)
OX and OH are weak field ligands.
In [Ti(NH 3 ) 6 ] 3+
Ti +3 = [Ar] 3d 1 (one unpaired electron)
In [V(gly) 2 (OH) 2 (NH 3 ) 2 ] +
V +5 = [Ar] 4r 0 3d 0 (no unpaired electron)
In [Fe( en )( bpy )(NH 3 ) 2 ] 2+
Fe +2 = [Ar] 3d 6 (4 unpaired electrons)
But due to presence of strong field ligand like NH 3 , bpy and en thus Fe +2 contains no unpaired electron.
_ Complex [Co( ox ) 2 (OH) 2 ] _ has maximum number of unpaired electrons, thus show maximum paramagnetism.