Question

Of the two allotropes – white and red phosphorus, __ Phosphorus does not react with alkali solution.

Answer 1

White phosphorus reacts with alkali solution while red phosphorus does not. This can be used to separate a mixture of the two allotropes. Alternatively, now that you know that only white P is soluble in $C{S}_2$, this fact can also be used to separate a mixture of the allotropes. What would be the products when white phosphorus reacts with alkali solution?