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The oxidation state of chromium in `Cr(CO)_(6)` is
A. covalent bonding
B. coordinate bonding
C. synergic bonding
D. ionic bonding

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Correct Answer - D
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`Cr-C pi` bond is formed by the donation of a pair of electrons from a filled d-orbitals of Cr into the vacant antibonding `pi^(**)` orbtial of Co. This is synergic bonding due to which both `sigma` and `pi` character is shown in `Cr-C` bond .

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