# The pair that contains two

Question:

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

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

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

3. $\mathrm{H}_{3} \mathrm{PO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$

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

Correct Option: 1,

Solution:

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