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(D) The strong reducing behavior of $H_3PO_2$ (hypophosphorous acid) is attributed to its molecular structure.In $H_3PO_2$,the phosphorus atom is bond

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presence of one $-OH$ group and two $P-H$ bonds

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(D) The strong reducing behavior of $H_3PO_2$ (hypophosphorous acid) is attributed to its molecular structure.In $H_3PO_2$,the phosphorus atom is bonded to two hydrogen atoms directly ($P-H$ bonds) and one hydroxyl group ($-OH$ bond).Any oxyacid of phosphorus that contains at least one $P-H$ bond acts as a reducing agent.Since $H_3PO_2$ contains two $P-H$ bonds,it exhibits strong reducing properties.

Strong reducing behaviour of $H_3PO_2$ is due to

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