Chemistry · Coordination Compounds

JEE Main 2026 — 22 January, Evening Shift — Question 59

$\left[\mathrm{Ni}\left(\mathrm{PPh}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ 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 $\mathrm{Ni}(\mathrm{CO})_{4}$ .

Choose the correct answer from the options given below :

Option A:
A and B only
Option B:
A, B and D only
Correct
Option C:
C and D only
Option D:
C, D and E only

Answer: B

Step-by-step solution

$\left[\mathrm{Ni}\left(\mathrm{PPh}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ Given : Paramagnetic complex hence it must be tetrahedral so

Crystal field splitting : (A) Tetrahedral complex not show geometrical isomerism. (B) Complex is Blue colour (C) Calculated spin only magnetic moment of the complex is $2.84 \mathrm{~B} . \mathrm{M}$ . (D) C.F.S.E $=-0.6 \Delta_{\mathrm{t}}(4)+0.4 \Delta_{\mathrm{t}}(4)$ $=-0.8 \Delta_{\mathrm{t}}\left(\operatorname{not}-0.8 \Delta_{0}\right)$ (E) $\mathrm{Ni}(\mathrm{CO})_{4}$ also tetrahedral

Hence only A, B, D correct.

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 22 January, Evening Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes