JEE Advanced Chemistry question

Pyrophosphorous acid, H4P2O5

(A)Is dibasic acidCorrect
(B)Contains P in + 5 oxidation state
(C)Contains one P − O − P bondCorrect
(D)Is strongly reducing in natureCorrect

Answer: (A),(C),(D)

Solution

Pyrophosphorous acid has two phosphorus atoms, each bearing one P–H bond and one ionisable P–OH, joined through a single bridging oxygen (one P–O–P linkage); the two P–OH groups make it dibasic, confirming (a) and (c). The retained P–H bonds (one on

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Question ID VK-159283