Which of the following does not exist?

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(C) $[SiCl_6]^{2-}$ does not exist because six large $Cl^{-}$ ions cannot be accommodated around the small $Si^{4+}$ ion due to steric hindrance and i

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$[SiCl_6]^{2-}$

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(C) $[SiCl_6]^{2-}$ does not exist because six large $Cl^{-}$ ions cannot be accommodated around the small $Si^{4+}$ ion due to steric hindrance and inter-electronic repulsion between the chloride ions.In contrast,$[SiF_6]^{2-}$ exists because the $F^{-}$ ion is small enough to fit around the $Si^{4+}$ ion.$[GeCl_6]^{2-}$ and $[Sn(OH)_6]^{2-}$ are stable due to the larger size of the central $Ge^{4+}$ and $Sn^{4+}$ ions,which can accommodate six ligands.

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