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Why is red phosporus less reactive than ...

Why is red phosporus less reactive than white phosphorus?

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White phosphorus is discrete `P_(4)` molecule having tetrahedral shape and have very high angular strain in the molecule, as the angles are 60 degrees each. This high angular strain makes white phosphorus unstable and highly reactive. Red phosphorus on the other hand, is a polymeric structure and consists of `P_(4)` tetrahedra linked together, which has much less angular strain and hence more stable and less reactive than white phosphorus.
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