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The paramagnetic nature of a complex increases with the number of unpaired electrons. Among the following, which complex exhibits the highest number of unpaired electrons?

1. [V(gly)2(OH)2(NH3)2]+
2. [Fe(en)(bpy)(NH3)2]2+
3. [Co(Ox)2(OH)2]−
4. [Ti(NH3)6]3+

Correct answer: [Ti(NH3)6]3+

Solution

The complex [Ti(NH3)6]3+ contains Ti3+ (d1 configuration), which has one unpaired electron. The other complexes have fewer or no unpaired electrons due to ligand field effects or pairing. Thus, [Ti(NH3)6]3+ exhibits the maximum paramagnetic behavior.

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