Question

Which of the following oxoacid of phosphorus contains a $P-O-P$ bond?

• A. Pyrophosphoric acid
• B. Hypophosphoric acid
• C. Hypophosphorous acid
• D. Phosphorous acid

Answer 1

The correct option is A Pyrophosphoric acid

Pyrophosphoric acid $\left(H_4{P}_2{O}_7\right)$:
Hypohosphoric acid $\left(H_4{P}_2{O}_6\right)$:
Hypophosphorous acid $\left(H_{3}P{O}_2\right)$:
Phosphorous acid $\left(H_{3}P{O}_3\right)$: