1.

Which of the following is a cyclic oxo acid ?

Answer»

<P>`H_(4)P_(2)O_(7)`
`H_(4)P_(2)O_(6)`
`H_(3)P_(3)O_(9)`
`H_(5)O_(5)O_(15)`

Solution :`(HPO_(3))_(3)=H_(3)P_(3)O_(9)` is a six-membered cyclic oxoacid.
`(HPO_(3))_(5)=H_(5)P_(5)O_(15)` cannot be regarded as a cyclic oxo acid since ten-membered rings are difficult of form. Therefore, it has a CHAIN STRUCTURE.


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