Which one of the following does not exist? 1. `XeO_(4)` 2. `NeF_(2)` 3. `XeF_(2)` 4. `XeF_(6)`

Explanation

The sum of the first two ionisation enthalpies of Ne are much higher than those of Xe. Hence, `F_(2)` can oxidise Xe to `Xe^(2+)` but cannot oxidise Ne to `Ne^(2+)`. Therefore `NeF_(2)` does not exist. However, all the other fluorides of xenon viz., `XeF_(2)` and `XeF_(6)` and also xenon oxyfluoride `(XeOF_(4))`, do exist.