Which plays a major role in the formation of complex compound ?

Transition metal

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Lanthanides and actinides

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Representative elements

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p-block element

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Solution

The correct option is D Transition metal
Because of the presence of unpaired electrons in the inner d-orbital, transition element forms coordination complexes with appropriate ligand.
$K_{3} F e (C N)_{6}$
$N i (C O)_{4}$

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