Question

Which species does not exist?

• A. ${\left(Sn{Cl}_6\right)}^{2-}$
• B. ${\left(Ge{Cl}_6\right)}^{2-}$
• C. ${\left(C{Cl}_6\right)}^{2-}$
• D. ${\left(Si{Cl}_6\right)}^{2-}$

Answer 1

The correct option is C ${\left(C{Cl}_6\right)}^{2-}$

${\left(C{Cl}_6\right)}^{2-}$ species does not exist. Carbon cannot accept $6{Cl}^{-}$, since it has no vacant $d$-orbitals.