Question

What is Basicity of hypo phosphorous acid?​

Answer 1

In H3PO2, 2 H-P bonds,1 P=O. bond and 1 “P-O-H bond” is present. Thus,1 replaceable hydrogen atom (the one attached to oxygen atom) is present. Hence basicity of H3PO2 is 1.

For hydrogen to be acidic it must be attached to a strongly electronegative atom. It has two P−OH bonds and one P−H bond. Hence, its basicity is 2. Here it is attached to 2 oxygen Hence basicity of H3PO3 is 2.