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(D) The complex $[HgI_3]^{-}$ involves the $Hg^{2+}$ ion. The electronic configuration of $Hg^{2+}$ is $[Xe] 4f^{14} 5d^{10}$.Since the $d$-orbitals a

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Both $A$ and $B$

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(D) The complex $[HgI_3]^{-}$ involves the $Hg^{2+}$ ion. The electronic configuration of $Hg^{2+}$ is $[Xe] 4f^{14} 5d^{10}$.Since the $d$-orbitals are completely filled,the central metal ion does not participate in $sp^2$ hybridisation in the way a main group element would.In reality,$[HgI_3]^{-}$ adopts a trigonal planar geometry due to the steric arrangement of the three iodide ligands around the mercury center,but the bonding is primarily ionic/covalent with $d^{10}$ configuration.However,the statement that it has $sp^2$ hybridisation is chemically incorrect because $Hg^{2+}$ is a $d^{10}$ system and does not typically undergo $sp^2$ hybridisation for this geometry.Since both $A$ and $B$ are technically incorrect descriptions of the bonding and geometry,option $D$ is the correct answer.

Which statement is incorrect regarding the complex $[HgI_3]^{-}$?

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