PCl5 and PH3 exist but PH5 does not because

PH3 exists but PH5 does not exist due to the absence of d-orbital contraction while both PCl3 and PCl5 exist.In PH3 hybridization is absent according to Drago's rule.

PCl5 and PH3 exist but PH5 does not because

PH3 exists but PH5 does not exist due to the absence of d-orbital contraction while both PCl3 and PCl5 exist.In PH3 hybridization is absent according to Drago's rule.

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PCl₅ and PH₃ exist but PH₅ does not because

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Phosphorous has no vacant orbitals

PH₅ is unstable

EN of hydrogen is less as compared to chlorine to excite electron from p orbital to d orbital for bond formation

Phosphorous exists as P₄

answer is D.

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Detailed Solution

PH₃ exists but PH₅ does not exist due to the absence of d-orbital contraction while both PCl₃ and PCl₅ exist.
In PH₃ hybridization is absent according to Drago's rule.

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