Question

white phosphorus is not soluble in water but soluble in carbon disulphide.why??

Answer 1

White Phosphorus, being non polar in nature, can’t react with water as it’s polar. Also it’s a highly strained compound, it can’t be stored exposed anywhere else. So Water is the ideal medium.
But with time, it might dissolve eventually very slowly.
Whereas
White phosphorus has P4 molecules packed into a crystal. These dissolve readily in CS2.

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Answer 2

White Phosphorus, being non polar in nature, can't react with water as it's polar. ... White phosphorus has P4 molecules packed into a crystal. These dissolve readily in CS2.