Question

Consider the following reaction:
$A+\text{alkali}\to B\text{(Major product)}$
If $B$ is an oxoacid of phosphorus with no $P-H$ bond, then $A$ is:

• A. $\text{White}{P}_4$
• B. $H_{3}P{O}_3$
• C. $\text{Red}{P}_4$
• D. $P_2{O}_3$

Answer 1

The correct option is C $\text{Red}{P}_4$

$\text{White}{P}_4+\text{alkali}\to H_{3}P{O}_2$
$\text{Red}{P}_4+\text{alkali}\to H_4{P}_2{O}_6$