Question

Compare the structures of white phosphorus, P₄O₆ and P₄O₁₀.

Answer 1

1. White phosphorus (P₄) has a tetrahedral structure consisting of four phosphorus atoms at the corners of a regular tetrahedron. Each P atom is bonded to the other three phosphorus atoms with a bond angle of 60°.

2. P₄O₆ structure is formed by replacing the \[\ce{P - P}\] bonds of P₄ with \[\ce{P - O - P}\] linkages, maintaining a similar tetrahedral-like cage but with oxygen atoms bridging phosphorus atoms.

3. P₄O₁₀ also has a cage-like structure similar to P₄O₆ but with more oxygen atoms attached, resulting in a fully oxidised phosphorus pentoxide molecule (P₄O₁₀) with phosphorus atoms bonded to oxygen atoms, forming \[\ce{P = O}\] bonds and \[\ce{P - O - P}\] bridges.

4. White phosphorus is elemental and consists only of phosphorus atoms, while P₄O₆ and P₄O₁₀ are molecular oxides of phosphorus with oxygen atoms incorporated, making their structures more complex with bridging and double bonds.

Thus, white phosphorus is a tetrahedral P₄ molecule, P₄O₆ is a less oxidised cage with \[\ce{P - O - P}\] bridges, and P₄O₁₀ is a more oxidised, fully oxygenated cage structure.