Which of the following fluorides does not exist?

N F_{5}

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P F_{5}

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A s F_{5}

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S b F_{5}

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Solution

The correct option is A $N F_{5}$
Except nitrogen and bismuth, all elements of fifth group form pentahalides - especially pentafluorides. Nitrogen cannot form pentahalides because it cannot expand its octet due to non-availability of d-orbitals.

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