JEE PYQ: P Block Elements Question 9
Question 9 - 2021 (18 Mar Shift 1)
The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:
(1) 3
(2) 0
(3) 2
(4) 1
Show Answer
Answer: (3)
Solution
$\text{PCl}_3 + \text{H}_3\text{PO}_3 \to \text{H}_4\text{P}_2\text{O}_5$. The product has two ionisable H atoms (two P-OH groups).