Explain the comparison of the reactivity of allotropes of phosphorus.

White Phosphorus is the most reactive while black P is the least reactive. The reactivity decreases in the order

white P> Red P > Black P

Stability will be just opposite to the above order

Property White phosphorus Red phosphorus Black phosphorus
Colour White Dark red Black
State Waxy solid Brittle powder Cristalline with greasy
Density 1.84 2.1 2.69
Ignition temperature 307K 533K 673K
Smell Garlic smell Odourless
Melting point 317K Doesn’t melt 860K

In addition to this violet phosphorus also present,which is not a significant allotrope.

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