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In which compound synergic effect is pre...

In which compound synergic effect is present ?

A

`[Ni(CO)_(4)]`

B

`[NiCl_(4)]^(2-)`

C

`["CuCl"_(4)]^(2-)`

D

`["Mn"("H"_(2)"O")_(6)]^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
A
The M-C `pi`-bond in metal carbonyl is formed by the donation of an electron pair from a filled d-orbital of metal into the vacant antibonding `pi`-orbital of CO, strengthens the M-C `sigma`-bond. This is called synergic effect and is usually observed in metal carbonyls. Thus, `["Ni(CO)"_(4)]` exhibits synergic effect.
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