Which one of the following does not exist?

X e F_{4}

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N e F_{2}

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X e F_{2}

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X e F_{6}

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Solution

The correct option is B $N e F_{2}$
A number of xenon compounds mainly with most electronegative elements like fluorine and oxygen are known. But no true compounds of Ar, Ne or He are yet known due to their extreme inertness. Hence, $N e F_{2}$ is not known or it does not exist.
$X e (g) + F_{2} (g) 673 K, 1 b a r - ----- \to X e F_{2} (s)$
(xenon in excess)
$X e (g) + 2 F_{2} (g) 873 K, 7 b a r - ----- \to X e F_{4} (s)$
(1:5 ratio)
$X e (g) + 3 F_{2} (g) 573 K, 60 - 70 b a r - -------- \to X e F_{6} (s)$
(1:20 ratio)

So, the correct option is (ii).

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