Hypophosphorous acid (H3PO2) and Phosphorous acid (H3PO3) act as as good reducing agents while H3PO4 does not.Why?

We know that In Hypo phosphorous acid (H₃PO₂) has two H atoms are bonded directly to P atom and In Phosphorous acid (H₃PO₃) has one H atom is bonded directly to P atom which imparts reducing character to the acid, whereas in H₃PO₄ there is no H atom bonded directly to P atom hence it does not have reducing character.

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Hypophosphorous acid (H3PO2) and Phosphorous acid (H3PO3) act as as good reducing agents while H3PO4 does not.Why?