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Resonance Effect

Among these s...

Question

Among these species, the correct order of resonance energy is:

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 $I > I I > I I I$
Order is $I > I I > I I I$
I) $H N = C H - N H^{⊖} ⟷ N H^{-} - C H = N H$
Equivalent Resonance
II) $O = C H - N H^{-} ⟷ O^{⊖} - H C = N H$
negative charge on most eletronegative element.
III) $H C = O C - H O ⟷ H C - O C = O^{+} - H$
$\oplus$ charge on $O$ is unstable

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