A) \[{{\operatorname{H}}_{3}}P{{O}_{2}}\]
B) \[{{\operatorname{H}}_{3}}P{{O}_{3}}\]
C) \[{{\operatorname{H}}_{3}}P{{O}_{4}}\]
D) \[{{H}_{4}}{{P}_{2}}{{O}_{6}}~~\]
Correct Answer: A
Solution :
Hypophosphorous acid \[\left( {{H}_{3}}P{{O}_{2}} \right)\] is a monobasic acid which acts as reducing agent. In this molecule two \[\operatorname{P} - H\] bonds are responsible for its reducing character and one \[2HI\,\,+\,\,{{H}_{2}}S{{O}_{4}}\,\,\to \,\,2{{H}_{2}}O\,\,+\,\,\underset{Violet\,\,vapour}{\mathop{{{I}_{2}}\,\,+\,\,S{{O}_{2}}}}\,\uparrow \] bond is responsible for its monobasic acid character.
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