Compare relative stability of the following resonating structure.

(i) > (i i) > (i i i)

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(i i) > (i) > (i i i)

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(i) > (i i i) > (i i)

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(i i) > (i i i) > (i)

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Solution

The correct option is A $(i) > (i i) > (i i i)$
Rules of stability in resonance structures:
Uncharged resonance structures are more stable than charged resonance structure.
The negative charge is more stable on Oxygen compared to Nitrogen.
According to (1) (i) more stable than (ii),(iii)
According to (2) (ii) more stable than (iii)
Thus, the correct order of stability is $(i) > (i i) > (i i i)$

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