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The correct stability order of the following resonance structures is `{:((a) H_(2)C = overset(+)N - N^(-) ," "H(2)overset(+)C-N=N^(-)),( (I), " "(II)),(H_(2) overset(-)C-overset(+)N-=N,H_(2)overset(-)C-N=overset(+)N),((III)," "(IV)):}`A. `(I) gt (II) gt (IV) gt (III)`B. `(I) gt (III) gt (II) gt (IV)`C. `(II) gt (I) gt (III) gt (IV)`D. `(III) gt (I) gt (IV) gt (II)` |
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Answer» Correct Answer - B (i)Greater the number of `pi-`bonds, greater is the delocalisation of electrons, greater is the stability. (ii) A reaonating structure is more stable is the negative charge is on electronegative atom and positive charge on electropositive atom. (iii) Like charge should not be close and unlike charges should not be widely separated . Keeping above points in view , the stability order will be `(I) gt (III) gt (II) gt (IV)` . |
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