Multiple choice

Out of white, red and black phosphours, which is most reactive?

  1. White

  2. Red

  3. Black

  4. None of these

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A Correct answer
Explanation

White phosphorus is the most reactive allotrope due to its strained P4 tetrahedral structure with 60° bond angles (far from the ideal 90-100°). It ignites spontaneously in air and must be stored under water. Red and black phosphorus have polymeric structures and are much more stable.

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