White Phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of \(\mathrm{CO_2}\) gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is :
Show Hint
- 2
- 4
- 1
- 3
The Correct Option is C
Solution and Explanation
Acidification: \(\mathrm{NaH_2PO_2 + HCl \rightarrow H_3PO_2 + NaCl}\), so Y = hypophosphorous acid \(\mathrm{H_3PO_2}\).
Structure of \(\mathrm{H_3PO_2}\): \(\mathrm{H_2P(=O)OH}\); only one OH group (the two P-H bonds are not ionisable), so its basicity is 1.
Answer: (3) 1
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