Ozone is diamagnetic whereas dioxygen is paramagnetic.
Ozone being unstable is more reactive than stable dioxygen.
Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen.
Hence, Option "$D$" is the correct answer.
$(A)$ $BF _{3}$
$(B)$ $SiCl _{4}$
$(C)$ $PCl _{5}$
$(D)$ $SF _{6}$