In which compound synergic effect is present

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${[{NiCl}_{4}]}^{2 -}$

$[Ni (CO)_{4}]$

${[Mn {(H_{2} O)}_{6}]}^{2 +}$

${[{CuCl}_{4}]}^{2 -}$

answer is A.

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Detailed Solution

The M−C π-bond in metal carbonyl which is formed by the donation of an electron pair from a filled d-orbital of metal into the vacant antibonding π-orbital of CO, strengthens the M−C σ-bond. This is called synergic effect and is usually observed in metal carbonyls. Thus, [Ni(CO)₄] exhibit synergic bonding.

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