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Question

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

A
[Mn(CO)6]+
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B
[Fe(CO)5]
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C
[Cr(CO)6]
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D
[V(CO)6]
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Solution

The correct option is B [Fe(CO)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 [Fe(CO)5], therefore CO bond order is lowest here.

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