Question

Assertion: All $F-S-F$ angle in $S{F}_4$ are greater than ${90}^o$ but less than ${180}^o$.
Reason: The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

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

Answer 1

The correct option is D If both the assertion and reason are false

$S{F}_4$ has see-saw type structure in which bond angles are different between different $S-F$ atoms. It has non-planar structure. According to VSEPR theory $lp-lp$ repulsion $>lp-bp>bp-bp$ repulsion.