Which of the following complexes will show strong Jahn-Teller distortion?

[C u (H_{2} O)_{6}]^{2 +}

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[C r (H_{2} O)_{6}]^{3 +}

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[M n (H_{2} O)_{6}]^{2 +}

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[C o (H_{2} O)_{6}]^{3 +}

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Solution

The correct option is A $[C u (H_{2} O)_{6}]^{2 +}$
The complexes in which the metal ion have a unsymmetrical eg or $t_{2} g$ orbital shows Jahn-taller distortions. In the complex $[C u (H_{2} O)_{6}]^{2 +}$ the configuration is $t_{2} g^{6} e g^{3}$ i.e eg orbital is unsymmetrical and hence will show Jahn-Taller distortions.Option A is correct.

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Similar questions

Q. Among the complex ions

[T i (H_{2} O)_{6}]^{3 +}, [C r (H_{2} O)_{6}]^{2 +}, [F e (H_{2} O)_{6}]^{2 +}

and

[C o (H_{2} O)_{6}]^{2 +}

, the one that shows strongest distortion from regular octahedral structure is:

The d - electron configurations of $M n^{2 +}, F e^{2 +}, C o^{3 +}, a n d N i^{2 +} a r e 3 d^{5}, 3 d^{6}, 3 d^{6}, 3 d^{8},$ respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?

Q. Jahn-Teller effect is not observed spin complexes of:

Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)

Q. Jahn-Teller effect not observed in high spin
complexes of :-

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Which of the following complexes will show strong Jahn-Teller distortion?

The correct option is A [Cu(H2O)6]2+The complexes in which the metal ion have a unsymmetrical eg or t2g orbital shows Jahn-taller distortions. In the complex [Cu(H2O)6]2+ the configuration is t2g6eg3 i.e eg orbital is unsymmetrical and hence will show Jahn-Taller distortions.Option A is correct.