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Which one of the following does not ex...

Which one of the following does not exist ? Why ? `XeOF_(4),NeF_(2),XeF_(2),XeF_(6)`

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`NeF_(2)` does not exist due to very high ionisation enthalpy `(2080kJ"mol"^(-1))` of neon .
Ionisation enthalpy of xenon is low `(1170kJ "mol"^(-1))` os its compounds `XeOF_(4),XeF_(2)andXeF_(6)` exist.
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