Question
$\left\lbrack Ni\left( {PPh}_{3} \right)_{2}{Cl}_{2} \right\rbrack$ is a paramagnetic complex. Identify the INCORRECT statements about this complex.
A. The complex exhibits geometrical isomerism.
B. The complex is white in colour.
C. The calculated spin-only magnetic moment of the complex is 2.84 BM .
D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $- 0.8\Delta_{0}$.
E. The geometrical arrangement of ligands in this complex is similar to that in $Ni(CO)_{4}$.
Choose the correct answer from the options given below :
Options
Solution
$\left\lbrack Ni\left( {PPh}_{3} \right)_{2}{Cl}_{2} \right\rbrack$
Given : Paramagnetic complex hence it must be tetrahedral so
Crystal field splitting:
$${Ni}^{+ 2} = (Ar)3{\text{ }d}^{8}$$
(A) Tetrahedral complex not show geometrical isomerism.
(B) Complex is Blue colour
(C) Calculated spin only magnetic moment of the complex is $2.84\text{ }B.M$.
(D) C.F.S.E $= - 0.6\Delta_{t}(4) + 0.4\Delta_{t}(4)$
$$= - 0.8\Delta_{t}\left( not - 0.8\Delta_{0} \right) $$(E) $Ni(CO)_{4}$ also tetrahedral
Hence only A, B, D correct.
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