Textbook Problem

Many structures of phosphorus-containing compounds are drawn with some P9O bonds. These bonds are not the typical π bonds we’ve considered, which involve the overlap of two p orbitals. Instead, they result from the overlap of a d orbital on the phosphorus atom with a p orbital on oxygen. This type of π bonding is sometimes used as an explanation for why H₃PO₃ has the first structure below rather than the second:

Draw a picture showing how a d orbital and a p orbital overlap to form a π bond.