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  4. The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :

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Q. The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two $P-H$ bonds, is :

JEE MainJEE Main 2022The p-Block Elements - Part2

Solution:

$P _{4}+3 NaOH +3 H _{2} O \rightarrow PH _{3}+3 NaH _{2} PO _{2}$
oxoacid $= H _{3} PO _{2}$ (hypo phosphorus acid) or (phosphinic acid)