First slide

Aplicaitons of VBT

Question

Which among the following is a paramagnetic complex?

Moderate

A

${[Co {({NH}_{3})}_{6}]}^{3 +}$
B

$[Pt (en) {Cl}_{2}]$
C

${[{CoBr}_{4}]}^{2 -}$
D

$Mo (CO)_{6}$

Solution

${Co}^{2 +} = (3 d^{7})$
Bromine is a weak ligand but it is known that all tetrahedral complexes are high-spin regardless of the splitting power of the ligand. The low spin arrangement has five unpaired electrons in the d -orbitals. So it is paramagnetic in nature.

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