PCl5→H2OXintermediate→H2OYfinal ;  PCl5→C2H5OHX;X and Y are compounds of phosphorous. Hybridization of phosphorous in the molecule ‘X’ is

PCl5+H2O→ POCl3(X)+2HCl; POCl3(X)+3H2O→ H3PO4(Y)+3HCl; PCl5+C2H5OH→ C2H5Cl+POCl3(X)+HCl Structure of POCl3According to VESPER theory, the central atom has four bond pair (3 single bonds and a double bond). It is a tetrahedral molecule. Hybridization of central atom is sp3.