Select complex in which no distortion is observed in octahedral geometry :- | TestHub

Passage / Comprehension

Conditions for various types of distortion in octahedral complexes, according to the Jahn-Teller theorem, depend on the symmetric and unsymmetric electronic distribution of electrons in the t₂gand e_g orbitals:

(1) t₂g (symmetric) + e_g (symmetric) $\Rightarrow$ No distortion

(2) t₂g (unsymmetric) $\Rightarrow$ Slight distortion

(3) e_g (unsymmetric) $\Rightarrow$ Strong distortion

Select complex in which no distortion is observed in octahedral geometry :-

Options:(select one or more)

Answer:

A, B, D

Solution:

For no Jahn–Teller distortion, both $t_{2 g}$ and $e_{g}$ should have symmetrical electron distribution.

A. $[C r (N H_{3})_{6}]^{3 +}$

$C r^{3 +} = d^{3} \to t_{2 g}^{3} e_{g}^{0} \to$ symmetric

B. $[C o (CN)_{6}]^{3 -}$

$C o^{3 +} = d^{6}$ , $C N^{-}$ strong field $\to t_{2 g}^{6} e_{g}^{0} \to$ symmetric

C. $[C o F_{6}]^{3 -}$

$C o^{3 +} = d^{6}$ , $F^{-}$ weak field $\to t_{2 g}^{4} e_{g}^{2} \to t_{2 g}$ unsymmetrical

D. $[N i (H_{2} O)_{6}]^{2 +}$

$N i^{2 +} = d^{8} \to t_{2 g}^{6} e_{g}^{2} \to$ symmetric

Answer: A, B, D.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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