Assertion : $X e F_{4}$ exists while $X e H_{4}$ does not exist. Reason: In $X e H_{4}$ d-orbital contraction is absent.

The Assertion is true, the Reason is true and Reason is the correct explanation for Assertion

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The Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion

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Assertion is true, Reason is false.

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Assertion is false, Reason is true.

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Solution

The correct option is A The Assertion is true, the Reason is true and Reason is the correct explanation for Assertion
In $X e H_{4}$ d-orbital contraction is absent. Whereas in d-orbital contraction is present $X e F_{4}$ .
This is because $F$ is much more electronegative than hydrogen.
Hence, $X e F_{4}$ exists while $X e H_{4}$ does not exist.

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Assertion :XeF4 exists while XeH4 does not exist. Reason: In XeH4 d-orbital contraction is absent.

Assertion : $X e F_{4}$ exists while $X e H_{4}$ does not exist. Reason: In $X e H_{4}$ d-orbital contraction is absent.