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Which of the following organometallic compound is a sigma and pi bonded? .
A. `[Fe(eta^(5)-C_(5)H_(5))_(2)]`
B. `K[PtCl_(3)(eta^(2)-C_(2)H_(4))]`
C. `[Co(CO)_(5)NH_(3)]^(2+)`
D. `Fe(CH_(3))_(3)`

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Correct Answer - C
`[Co(CO)_(5)NH_(3)]^(2+)` In this complex, Co-atom attached with `NH_(3)` through `sigma`-bonding and with CO through dative `pi`-bond

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