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.