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Assertion [Ni (CO)(4)] has longer C-O bo...

Assertion `[Ni (CO)_(4)]` has longer `C-O` bond length than the same in `[Cr(CO)_(5) NH_(3)]`
Reason There is greater extent of `d pi - rho pi` back bonding in `[Ni (CO)_(4)]` than in `[Cr (CO)_(5) NH_(3)]`

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