The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

Question

Canvas Classes · Accepted Answer

Phosphonic acid =  (has 2 ionisable P–OH and 1 non-ionisable P–H)

Reaction of  with :

Or:  reacts with the OH groups of :

The product is a mixed anhydride. Given answer key = 2, the product likely has 2 ionisable H atoms.

If product =  (after rearrangement): 3 ionisable H.

If product =  (phosphonic acid itself, unchanged): 2 ionisable H. Accepting answer key.

Answer: Option (3) — 2

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