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Which of the following has longest `C-O` bond length? (Free `C-O` bond length in CO is `1.128Å`).

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Which of the following has longest `C-O` bond length? (Free `C-O` bond length in CO is `1.128Å`).
A. `1.158Å`
B. `1.128Å`
C. `1.178Å`
D. `1.118Å`
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On account of synergic interaction between metal and CO bond order of CO reduces to approximately two half from three in carbonmonoxide. Thus bond length increases to `1.158Å`
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