`[SiF_(6)]^(2-)` is known where as `[SiCl_(6)]^(2-)` not. Reason is

[SiF_(6)]^(2-) is known whereas [SiC_(6)]^(2-) not. The main reason is/are I Six large chloride ions cannot be accommodated around Si^(4+) due to limitation of its size. II. Interaction between lone pair of chloride ion and Si^(4+) is not very strong. Choose the correct option.

[SiF_(6)]^(2-) is known where as [SiCI_(6)]^(2-) does not exist because I) Six large chloride ions cannot be accommodated around Si^(4+) II) Ineraction between lone pair of chloride ion and Si^(4+) is not very strong III) Silicon is less electronegative than chlorine IV) Si^(4+) and Cl^(-) ions have same size

Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

Assertion (A) [SiF_(6)]^(2) is formed but [SiCl_(6)]^(2-) is not Reason (R ) Electronegativity (EN) of F is higher than EN of Cl