$\begin{array}{1 1} (a) \text{A square planar structure with the fluorines trans to each other} \\ (b) \text{A perfect tetrahedral arrangement of substituents around Xe} \\
(c) \text{A see-saw structure with F-Xe-F bond angle close to} 120^{\large\circ} \\
(d) \text{A see-saw structure with O-Xe-O bond angle close to }120^{\large\circ}\end{array}$
