[Ni(PPh3)2Cl2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. Choose the correct answer from the options given below :
- C and D Only
- A, B and D Only
- C, D and E Only
- A and B Only
Answer
(2) A, B and D Only
Solution
Ni is in the +2 state: Ni2+ = 3d8. A square planar (dsp2) d8 complex would be diamagnetic; since the complex is paramagnetic, it is sp3 hybridised, i.e. tetrahedral, with 2 unpaired electrons.
A. Tetrahedral complexes do not show geometrical isomerism (all four positions are adjacent to one another). Incorrect.
B. Ni2+ (d8) has partly filled d orbitals d–d transitions occur the complex is coloured, not white. Incorrect.
C. n = 2: = n(n+2) = 8 2.83 BM (≈ 2.84 BM). Correct.
D. Tetrahedral d8: e4 t24
CFSE = 4(-0.6 t) + 4(+0.4 t) = -0.8 t
t = 49 o CFSE = -0.8 49 o -0.36 o, not -0.8 o. Incorrect.
E. Ni(CO)4 is also tetrahedral (sp3). Correct.
Incorrect statements: A, B and D.
Answer: (2)