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In these molecules,![[SiCl_6]^{2-}](https://entrancecorner.codecogs.com/gif.latex?%5BSiCl_6%5D%5E%7B2-%7D)
is not stable. Because the chlorine atom is very large due to which silicon atom cannot accommodate six chlorine atoms. Thus due to interelectron repulsions or steric hindrance, this molecule is unstable.
Option 4 is correct.
Option 1)
![[SiF_6]^{2-}](https://entrancecorner.codecogs.com/gif.latex?%5BSiF_6%5D%5E%7B2-%7D)
Option 2)![[GeCl_6]^{2-}](https://entrancecorner.codecogs.com/gif.latex?%5BGeCl_6%5D%5E%7B2-%7D)
Option 3)![[Sn(OH)_6]^{2-}](https://entrancecorner.codecogs.com/gif.latex?%5BSn%28OH%29_6%5D%5E%7B2-%7D)
Option 4)