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Give reasons for the following : H3PO2 is a stronger reducing agent than H3PO3. - Chemistry

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Give reasons for the following : H3PO2 is a stronger reducing agent than H3PO3.

 

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Solution 1

Greater the number of element−hydrogen (E−H) bonds present in a compound, greater is the reducing nature of the compound. H3PO2has two P−H bonds while H3PO3 has one P−H bond. Thus, H3PO2 is a stronger reducing agent than H3PO3.

Solution 2

In case of H3PO3, there is only one P-H bond while in case of H3PO2, there are two P-H bonds. Hence H3PO2 is better reducing agent than H3PO3.

Concept: P - Block Group 15 Elements - Oxoacids of Phosphorus
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