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NCERT Class XI Chemistry Solutions

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Question : 12
Total: 40
H3PO3 can be represented by structures (i) and (ii) shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H3PO3 ? If not, give reasons for the same.
(i) H:
..
O
..
:
H
..
P
:
..
O
..
:
:
..
O
..
:H
(ii) H:
..
O
..
:
..
P
:
..
O
..
H
:
:
..
O
..
:H
Solution:  
These two cannot be called as canonical forms as relative position of hydrogen is changed. In resonance, canonical forms should differ only in the position of electrons and not in the position of atoms.
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