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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