The pair that contains two

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Question:
The pair that contains two $\mathrm{P}-\mathrm{H}$ bonds in each of the oxoacids is :

$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$
$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$
$\mathrm{H}_{3} \mathrm{PO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{3} \mathrm{PO}_{3}$

Correct Option: 1,

Solution:

$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$