Question

In $Si{F}_6^{2-}$ and $SiC{l}_6^{2-}$, which one is known and why?

• A. $Si{F}_6^{2-}$ because of small size of F.
• B. $Si{F}_6^{2-}$ because of large size of F.
• C. $Si{F}_6^{2-}$ because of small size of CI.
• D. $Si{F}_6^{2-}$ because of large size of CI.

Answer 1

The correct option is A $Si{F}_6^{2-}$ because of small size of F.

$Si{F}_6^{2-}$ is known to be existed because of small size of F.

As we go down the group in halides their existence is less stable because of large size of halogen that is the reason why $SiC{l}_6^{2-}$ do not exist.

Interaction between lone pairs of chlorine and $S{i}^{4+}$ is not very strong.

Hence option A is correct.