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  4. Assertion: All F - S - F angle in SF4 is greater than 90° but less than 180°. Reason: The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

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Q. Assertion : All $F - S - F$ angle in $SF_4$ is greater than $90^{\circ}$ but less than $180^{\circ}$.
Reason : The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

AIIMSAIIMS 2004Chemical Bonding and Molecular Structure

Solution:

$SF _{4}$ has see-saw type structure in which bond angles are different between different $S-F$ atoms. It has non-planar structure.
image
According to VSEPR theory
lone pair-lone pair repulsion > lone pair-bond pair repulsion > bond pair-bond pair repulsion.