Question

The reagent with which the following reaction is best accomplished is:

• A. $H_{3}P{O}_2$
• B. $H_{3}P{O}_3$
• C. $H_{3}P{O}_4$
• D. $NaHS{O}_3$

Answer 1

The correct option is A $H_{3}P{O}_2$

$H_{3}P{O}_2$ is the reagent that converts $-N_2^{+}{Cl}^{-}$ group into $H$. During this process $N_2$ and $HCl$ gases are released.