The IR stretching frequencies of free CO, and CO in [V(CO)_6]^-,[Cr(CO)_6]^-and [Mn(CO)_6]^- aie ...

Описание: The IR stretching frequencies of free CO, and CO in [V(CO)_6]^-,[Cr(CO)_6]^-and [Mn(CO)_6]^- aie 2143  cm^-1, 1860  cm^-1, 2000  cm^-1 and 2090  cm^-1, respectively. Then correct statement about metal carbonyls is :
(a) ' C-O ' bond is strongest in the cation and weakest in the anion.
(b) ' C-O ' bond is weakest in the cation and strongest in the anion.
(c) ' C-O ' bond is longer in the cation than in the anion.
(d) ' M-C ' pi bonding is higher in the cation.

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