Question

Explain why PCl5 and BiCl5 will behave differently during heating (write any reaction equations). Explain why both PF5 and PBr5 exist and that the same does BiF5, while BiBr5 does not exist.

Answer 1

Answer:

Write a balanced equation for the hydrolytic reaction of PCl5 in heavy water.

Answer

In moist air ,PCl5 hydrolysis to POCl3 and finally gets converted to phosphoric acid.The reaction is as follows:

PCL5 + H2O → POCl3 + 2HCl

phosphorus oxychloride

POCl3 + H2O → H3PO4 + 3HCl

phosphoric acid

But on treatment of PCl5 with heavy water (D2O) only phosphorus oxychloride if formed with the liberation of 2 molecules of deuterium chloride as a side product. The reaction involved is:

PCl5 + D2O → POCl3 + 2DCl