$[S i F_{6}]^{2 -}$ is known whereas $[S i C l_{6}]^{2 -}$ not. Give possible reasons.

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Solution

Due to smaller size of $F$ as compared to $C l$ , six small $F$ atoms can be easily accommodated around $S i$ atom while $C l$ cannot.
Since $F$ are present in smaller 2p orbital and $C l$ are present in larger 3p orbital therefore interaction of $F$ lone pair electron with d orbitals of silicon are stronger in $F$ as compared $C l .$

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