Question
Discuss the structure of phosphorous pentaoxide $\left( P _2 O _3\right)$.
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Answer
In $P _4 O _{10}$ each P atoms form three bonds to oxygen atom and also an additional coordinate bond with an oxygen atom. Terminal coordinate P - O bond length is 143 pm , which is less than the expected single bond distance. This may be due to lateral overlap of filled $p$ orbitals of an oxygen atom with empty d-orbital on phosphorous.
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