86. The infrared spectrum of synthesized [Co(CO)2(CN)2Br2]- exhibits two bands attributable to C-O stretching but only one band attributable to C-N stretching. What is the most likely arrangement of the coordinated CO and CN ligands around the Co center, respectively?
(A) cis C-O, trans C-N
(B) cis C-O, cis C-N
(C) trans C-O, cis C-N
(D) trans C-O, trans C-N
(E) None of the above
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