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Bonding in Metal Carbonyls

Among the fol...

Question

Among the following metal carbonyls, the C-O bond order is lowest in:

A

[M n (C O)_{6}]^{+}

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B

[F e (C O)_{5}]

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C

[C r (C O)_{6}]

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D

[V (C O)_{6}]^{-}

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Solution

The correct option is B $[F e (C O)_{5}]$
The complex in which back-bonding is maximum will have the lowest bond order.
Clearly, maximum back-bonding happens in option (c) i.e. in $[F e (C O)_{5}],$ therefore CO bond order is lowest here.

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