Step 1: In SF\(_4\), the central sulfur atom is surrounded by 4 fluorine atoms and one lone pair of electrons, leading to a see-saw molecular shape as per the VSEPR theory.
Step 2: The lone pair on the sulfur atom pushes the bonding fluorine atoms into a see-saw arrangement.
Thus, SF\(_4\) exhibits a see-saw structure.
From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are : 
Compound 'P' undergoes the following sequence of reactions : (i) NH₃ (ii) $\Delta$ $\rightarrow$ Q (i) KOH, Br₂ (ii) CHCl₃, KOH (alc), $\Delta$ $\rightarrow$ NC-CH₃. 'P' is : 
