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Which of the following is the most stabl...

Which of the following is the most stable resonance structure

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A

B

C

D

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( C) Structure `( c)` is the most stable resonance structure.
(i) Number of covalent bonds in `(a)` and `(b) = 13`.
(ii) Number of covalent bonds in `(c )` and `(d) = 14`
(iii) In `(c )`, positive charges is on `N`, whereas in `(d)`, it is on `O` atom, Since `N` is less `EN`(electronegative) than `O`, `(c )` is more stable.
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