Question

Which one of the following does not exist?

(i) $XeO{F}_4$

(ii) $Ne{F}_2$

(iii) $Xe{F}_2$

(iv) $Xe{F}_6$

Answer 1

$Ne{F}_2$ does not exist due to very high ionization enthalpy $\left(2080kJmo{l}^{-1}\right)$ of neon (Ne). Ionization enthalpy of xenon is low $\left(1170kJmo{l}^{-1}\right)$ so, its compounds $XeO{F}_4,Xe{F}_{2}andXe{F}_6$ exist.