Which one of the following does not exist?

(i) $X e O F_{4}$

(ii) $N e F_{2}$

(iii) $X e F_{2}$

(iv) $X e F_{6}$

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Solution

$N e F_{2}$ does not exist due to very high ionization enthalpy $(2080 k J m o l^{- 1})$ of neon (Ne). Ionization enthalpy of xenon is low $(1170 k J m o l^{- 1})$ so, its compounds $X e O F_{4}, X e F_{2} a n d X e F_{6}$ exist.

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