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The structural formula of hypophosphorous acid is:
A.
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B.
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C.
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D.
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Answer
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Hint: We need to remember that hypophosphorous acid is also called phosphinic acid. In chemistry, it is known to be a strong reducing agent. It is a phosphorus oxyacid which is physically colourless. It has a low-melting point and it is soluble in water, dioxane and alcohol.

Complete step by step answer:
We know that phosphorus has a valency of $5$. IT means it can make $5$ bonds with other atoms to satisfy its valency.
In the naming system, the polyatomic ions with two less oxygen atoms have the suffix “-ous” and prefix “hypo-”.
So according to the name hypophosphorous acid has two oxygen atoms less then the total number of oxygen atoms required.
Now, phosphorus atom will be linked with a double bond to one oxygen atom. And there are $3$ more valencies to be satisfied. Thus, phosphorus will bond with two hydrogen atoms and one hydroxide atom. Thus, the structure will be,
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Thus, this structure is called as hypophosphorous acid.
The chemical formula is ${H_3}P{O_2}$. But descriptively it can also be written as - $HOP(O){H_2}$. Since, in a descriptive manner, we can clearly observe the bonding as well and determine the structure easily.
Hence, the correct answer is option A.

Note:
We should remember that hypophosphorous acid is monoprotic in nature. It implies it can donate protons and form a covalent bond. Sal derived from this acid are called hypophosphites. In industries, it is mainly used for electroless nickel plating. More ambiently it is used as a salt. In many organic chemical reactions, it is used as a reducing agent. It is used to reduce arenediazonium salts. It is used as an additive in fischer esterification reactions.