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why is the order of acidity of oxyacids of phosphorus H3PO2>H3PO3>H3PO4, if the total number of FURNISHABLE hydrogens in H3PO2 is the least(JUST EQUAL TO 1)?

why is the order of acidity of oxyacids of phosphorus
H3PO2>H3PO3>H3PO4, if the total number of FURNISHABLE hydrogens in H3PO2 is the least(JUST EQUAL TO 1)?

Grade:12

2 Answers

anil kumar
38 Points
11 years ago

I guess it is the order of reduction power not acidity acidity of oxo acids increases with increase in oxidation state of central atom! Btw reductive power of h3po2 is more because it has two p-h bonds and p-h bonds are responsible for reduction power of acid

Gaurav
19 Points
7 years ago
It would be easily comparable if we compare the lewis structures of the conjugate bases of the given 3 acids. All 3 structures are stabilized by resonance with the doubly bonded O atom attached to P. However, as the number of -OH groups increase on the central atom, the no. of cross-conjugations also increase ( between -OH grp and P=O). These compete with the (O-) for resonance, hence destabilizing it.
 

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