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Question

Assertion :Although PF5,PCl5, and PBr5 are known, the pentahalides of nitrogen have not been observed. Reason: Phosphorous has lower electronegativity than nitrogen.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Assertion is incorrect but Reason is correct.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Assertion and Reason are both correct but Reason is not the correct explanation for Assertion.

Nitrogen does not form pentahalides because it does not have d-orbitals. The electronegativity of N is greater than that of phosphorus.
Hence option B is correct.

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