Which of the following does not exist?

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(C) The central atom $C$ (Carbon) belongs to the second period and has a maximum covalency of $4$ because it lacks $d$-orbitals in its valence shell.T

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$[CCl_6]^{2-}$

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(C) The central atom $C$ (Carbon) belongs to the second period and has a maximum covalency of $4$ because it lacks $d$-orbitals in its valence shell.Therefore,it cannot expand its octet to accommodate six ligands.In contrast,$Si$,$Ge$,and $Sn$ belong to the third,fourth,and fifth periods respectively,and possess vacant $d$-orbitals,allowing them to form hexacoordinated species like $[SiCl_6]^{2-}$,$[GeF_6]^{2-}$,and $[SnCl_6]^{2-}$.

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