Assertion : Although PF_5, PCl_5 and PBr_5 ar | vedclass

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(B) The Assertion is correct because nitrogen lacks $d-$orbitals in its valence shell,preventing it from expanding its octet to form $NX_5$ type compo

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If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) The Assertion is correct because nitrogen lacks $d-$orbitals in its valence shell,preventing it from expanding its octet to form $NX_5$ type compounds.The Reason is also correct because phosphorus $(2.19)$ has a lower electronegativity than nitrogen $(3.04)$.However,the inability of nitrogen to form pentahalides is due to the absence of $d-$orbitals,not due to its electronegativity. Therefore,the Reason is not the correct explanation of the Assertion.

Assertion : Although $PF_5, PCl_5$ and $PBr_5$ are known,the pentahalides of nitrogen have not been observed.
Reason : Phosphorus has lower electronegativity than nitrogen.

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Assertion : Although $PF_5, PCl_5$ and $PBr_5$ are known,the pentahalides of nitrogen have not been observed.Reason : Phosphorus has lower electronegativity than nitrogen.