What is the major structure of the oxy-acid of phosphorous?

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III

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Solution

The correct option is B
II

$H_{3} P O_{3}$ is more clearly described with the structural formula $H P O (O H)_{2}$ . In the solid state, $H P (O) (O H)_{2}$ is tetrahedral with one shorter $P = O$ bond of 148 pm and two longer $P - O (H)$ bonds of 154 pm.

From the given options, the structure corresponding to the above is (II).

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