Coordination Compounds 2 Question 43
45. The geometry of $Ni(CO)_4$ and $Ni\left(PPh_3\right)_2 Cl_2$ are
$(1999,2 M)$
(a) both square planar geometries
(b) tetrahedral and square planar, respectively
(c) both tetrahedral structures
(d) square planar and tetrahedral, respectively
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Answer:
Correct Answer: 45. (c)
Solution:
In $Ni(CO)_4$, $Ni$ is in $3 d^{10}$ state due to strong ligand field produced by $CO$. Hence, $Ni$ is $s p^{3}$-hybridised and complex is tetrahedral. In $NiCl_2(PPh_3)_2$, $Ni^{2+}$ has $3 d^{8}$-configuration. Due to weak ligand field, $Ni$ is $s p^{3}$-hybridised and complex is tetrahedral.
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