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Strong reducing behaviour of H3PO2 is due to

1. presence of one –OH group and two P–H bonds
2. high electron gain enthalpy of phosphorus
3. high oxidation state of phosphorus
4. presence of two –OH groups and one P–H bond

Correct answer: presence of one –OH group and two P–H bonds

Solution

H3PO2 (hypophosphorous acid) is a strong reducing agent because it contains two P–H bonds, which can donate electrons during redox reactions. The presence of these bonds is key to its reducing behavior.

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