The idealised oxidative-addition scheme retains both terminal CO groups and the η⁵-Cp ligand. Here Cp = C₅H₅⁻ and Re is group 7. Ionic counting assigns I⁻ and CH₃⁻ as two-electron X donors.
Select the INCORRECT statements.

Question

The idealised oxidative-addition scheme retains both terminal CO groups and the η⁵-Cp ligand. Here Cp = C₅H₅⁻ and Re is group 7. Ionic counting assigns I⁻ and CH₃⁻ as two-electron X donors.

Select the INCORRECT statements.

TestHub · Accepted Answer

The starting CpRe(CO)₂ is Re(I), d⁶, with 6+6+4 = 16 electrons. Oxidative addition of CH₃I raises Re to +3, d⁴; the product has 4+6+4+2+2 = 18 electrons. Thus B is false: the product has 18, not 20 electrons. Hapticity and terminal-CO donor count stay η⁵ and two, respectively. A is correct.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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