Consider the following compounds.

$$\begin{gathered} \left(P\right) {\mathrm{XeF}}_2 \\ \left(\mathrm{Q}\right) {\mathrm{XeF}}_4 \\ \left(\mathrm{R}\right)\hspace{0.17em}{\mathrm{XeF}}_6 \end{gathered}$$

The correct order of tendency to accept F- ion is

The order of the xenon flourides' increasing oxidising power is ${\mathrm{XeF}}_2, {\mathrm{XeF}}_4,$ and ${\mathrm{XeF}}_6$.
The core atoms' tendency to take electrons grows along with their oxidation state in the aforementioned order, which likewise increases their oxidising power.

thus, 

The correct order of tendency to accept F- ion is R > Q > P