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Chemistry Question on coordination compounds

The most stable complex among the following is

A

[Pd(CN)4]4−\left[ Pd ( CN )_{4}\right]^{4-}

B

[Fe(CO)5]\left[ Fe ( CO )_{5}\right]

C

[Ni(CN)4]4−\left[ Ni ( CN )_{4}\right]^{4-}

D

[Ni(CN)4]3−\left[ Ni ( CN )_{4}\right]^{3-}

Answer

[Fe(CO)5]\left[ Fe ( CO )_{5}\right]

Explanation

Solution

Stability of a complex depends upon the strength of ligand and charge of the central metal ion.
Stability of complex ∝\propto strength of ligand ∝\propto charge of central metal ion.
Among the given complexes, in [Ni(CN)4]3−\left[ Ni ( CN )_{4}\right]^{3-}, the charge of central metal ion is highest, ie, +1+ 1 while COCO is the strongest field ligand. Hence, [Fe(CO)5]\left[ Fe ( CO )_{5}\right] is the most stable complex among the given complexes.