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Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27]

1. + 2 6 2 ] ) O H ( Co [
2. [Fe(H 2 O) 6 ] 2+
3. [Mn(H 2 O) 6 ] 2+
4. [Cr(H 2 O) 6 ] 2+

Correct answer: + 2 6 2 ] ) O H ( Co [

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