question_answer

Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as

Assertion: All F?S?F angle is \[\text{S}{{\text{F}}_{\text{4}}}\] is 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 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

Correct Answer: D

Solution :

\[\text{S}{{\text{F}}_{4}}\]has see-saw type structure in which bond angles are different between different S?F atoms. It has non-planar structure. The lone-pair-bond pair repulsion is always greater than bond pair-bond pair repulsion.