question_answer

Which of the following does not contain P?O?P bond?              

A)  Isohypophosphoric acid

B)  Diphosphorus acid

C)  Diphosphoric acid     

D)  Hypophosphoric acid

Correct Answer: D

Solution :

Hypophosphoric acid \[({{H}_{4}}{{P}_{2}}{{O}_{6}})\] Isohypophosphoric acid \[({{H}_{4}}{{P}_{2}}{{O}_{6}})\] \[\text{H}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{OH} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{P}}}}\,-\text{O}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{OH} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{P}}}}\,-\text{OH}\] Diphosphorus acid (Pyrophosphorus acid, \[{{H}_{4}}{{P}_{2}}{{O}_{5}}\]) \[\text{H}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{OH} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{P}}}}\,-\text{O}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{OH} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{P}}}}\,-\text{H}\] Diphosphoric acid (Pyrophosphoric acid, \[{{H}_{4}}{{P}_{2}}{{O}_{5}}\])