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Regarding H(3)PO(3), its structur is as ...

Regarding `H_(3)PO_(3)`, its structur is as follows
`HO-underset(underset(H)(|))overset(overset(O)("||"))(P)-H`
Its basicity is one. Its salts are known as hyphophosphites
In the above structure the no. of `P pi-dpi` bonds

A

1

B

2

C

3

D

zero

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A
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