White phosphorus on reaction with concentrated $N a O H$ solution in an inert atmosphere of $C O_{2}$ gives phosphine and compound (X). (X) on acidification with $H C l$ gives compound (Y). The basicity of compound (Y) is:

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Solution

The correct option is D 1
$P_{4} + N a O H + H_{2} O \to P H_{3} + N a H_{2} P O_{2} H C l - - \to H_{3} P O_{2} + N a C l$
Here the product B which is mentioned in the question is $H_{3} P O_{2}$ . The structure of $H_{3} P O_{2}$ can be given as:

As only 1 Hydrogen atom is attached to the oxygen, its basicity is one.

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