18. Which of the following shows Jahn-Teller effect?
(A) [Fe(η⁵-C₅H₅)₂]⁺
(B) Fe(η⁵-C₅H₅)₂
(C) Co(η⁵-C₅H₅)₂
(D) Ni(η⁵-C₅H₅)₂
(E) none of the above

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