White phosphorus on reaction with concentrated $$NaOH$$ solution in an inert atmosphere of $${CO}_{2}$$ gives phosphine and compound $$(X)$$. $$(X)$$ on acidification with $$HCl$$ gives compound $$(Y)$$. The basicity of compound $$(Y)$$ is :
Correct option is C. $$1$$
The basicity of compound $$Y$$ is 1.
Hence, option $$C$$ is correct.