Jahn-Teller effect is not observed in high spin complexes of

$d^{7}$

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$d^{8}$

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$d^{4}$

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$d^{9}$

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Solution

The correct option is B
$d^{8}$

Key Idea Jahn-Teller distoration is observed in those octahedral complexes in which d-electrons are filled unsymmetrically.

Except $d^{8}$ , all are unsymmetrically filled, thus $d^{8}$ complex will not show Jahn-Teller distortion.

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