Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom//atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one `P=O` or `P rarr O` unit and one `P-OH` unit. The `OH` group is ionisable but `H` atom linked directly to `P` is non-ionisabl. Structures of all the acids are considered to be derived either from phosphorus acid or phosphoric acid. Which of the following is a cycle oxoacid ?A. `H_4 P_2 O_7`B. `H_4 P_2 O_6`C. `H_3 P_3 O_9`D. `H_5 P_5 O_15`

Phosphorus forms a number of oxoacids which differ in their structures

1.	Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom//atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one `P=O` or `P rarr O` unit and one `P-OH` unit. The `OH` group is ionisable but `H` atom linked directly to `P` is non-ionisabl. Structures of all the acids are considered to be derived either from phosphorus acid or phosphoric acid. Which of the following is a cycle oxoacid ?A. `H_4 P_2 O_7`B. `H_4 P_2 O_6`C. `H_3 P_3 O_9`D. `H_5 P_5 O_15`
Answer» Correct Answer - C `H_3 P_3 O_9 is (HPO_3)_3`.