Correct option is (b) XeF3
Xenon is an inert gas. Its electronic configuration is [Kr]4d105s25p6.
All orbitals that are filled have paired electrons.
When one, two or three electrons are promoted from 5p (filled) to 5d (empty) orbitals, two, four and six half-filled orbitals are formed.
Xenon can combine with even number of F atoms to form XeF2, XeF4 or XeF6. It cannot combine with odd number of F atoms.
Thus, formation of XeF3 and XeF5 is not possible.
