Which of the following species is not stable?

Options

A. `[SiCl_(6)]^(2-)`
B. `[SiF_(6)]^(2-)`
C. `[GeCl_(6)]^(2-)`
D. `[Sn(OH)_(6)]^(2-)`

Answer

A

Explanation

`[SiCl_(6)]^(-2)` is not stable due to steric hiderence develop by large size Cl atom on small size Si atom.