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.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

A

Explanation

(i) Due to smaller size of F, steric repulsions will be less in `SiF_(6)^(2-)`.
(ii) Interaction of F lone pair electrons with Si is stronger than that of chlorine lone pairs.