Incorrect statements for Ni(PPh3)2Cl2 paramagnetic complex
Q. [Ni(PPh3)2Cl2] 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 −0.8Δo.
E. The geometrical arrangement of ligands in this complex is similar to that in Ni(CO)4.
A. C and D Only
B. A, B and D Only
C. C, D and E Only
D. A and B Only
Correct Answer: A, B and D Only

Explanation

In the complex [Ni(PPh3)2Cl2], nickel is in +2 oxidation state.

Electronic configuration of Ni2+ is:

$$ \text{Ni}^{2+} : [Ar]\,3d^8 $$

This complex is tetrahedral due to bulky PPh3 ligands and weak field Cl⁻ ligands. Hence, it is paramagnetic with two unpaired electrons.

Statement A: Tetrahedral complexes do not show geometrical isomerism. Hence, statement A is incorrect.

Statement B: Paramagnetic Ni(II) complexes are generally coloured due to d–d transitions. Therefore, the statement that the complex is white is incorrect.

Statement C: For two unpaired electrons, spin-only magnetic moment is:

$$ \mu = \sqrt{n(n+2)} = \sqrt{2(2+2)} = \sqrt{8} = 2.83 \text{ BM} $$

This matches the given value 2.84 BM. Hence, statement C is correct.

Statement D: CFSE value −0.8Δo corresponds to an octahedral d⁸ configuration, not tetrahedral. Therefore, this CFSE value is incorrect for this complex.

Statement E: Ni(CO)4 is tetrahedral and this complex is also tetrahedral. Hence, the geometrical arrangement is similar. Statement E is correct.

Thus, the incorrect statements are:

A, B and D only

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