How many of the following species have a C–O bond longer than that in free CO? [V(CO)₆]⁻, [Fe(CO)₄]²⁻, Cr(CO)₆, CO⁺, CH₃OH, CO₂

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Back-donation lengthens C–O in [V(CO)₆]⁻, [Fe(CO)₄]²⁻ and Cr(CO)₆. The C–O single bond in CH₃OH (143 pm) and the C=O bonds in CO₂ (116 pm) are longer than the 113 pm of free CO. CO⁺ has a higher bond order and a shorter bond. Count = 5.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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