NEET2005Chemistryp Block Elements (Group 13 & 14)Actual
Assertion : SiF ₆ ²⁻ is known but SiCl ₆ ²⁻ is not. Reason : Size of fluorine is small and its lone pair of electrons interacts with d -orbitals of Si strongly.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion
Step-by-step solution
(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.