My chemistry textbook suggests that "acids which contain a P-H bond have strong reducing properties". Both hypophosphorous acid (H3PO2) and pyrophosphorous acid (H4P2O5) contain two P-H bonds; a P-O-P bond is present additionally in pyrophosphorous acid (as in the figures below). Which of these two turns out to be a stronger reducing agent, and why? Or do they have equal reducing properties?

Hypophosphorous Acid Pyrophosphorous Acid


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