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The N-O bond in NO_(2)^(-) is shorter than N-O bond in NO_(3)^(-). Account for this observation. |
Answer» Solution :`NO_(2)^(-)` is a resonance hybrid of two structures, I and II  while `NO_(3)^(-)` is a resonance hybrid of three structures, III, IV and V.  `:.` In `NO_(2)^(-)` BOND order of N-O bond is 3//2=1.5 since it has one duoble bond and one SINGLE bond, i.e., three bonds are shared between two O ATOMS. However, in `NO_(3)^(-)` bond order of N-O bond is 4//3=1.33 since it has one double bond and two single bonds, i.e., FOUR bonds are shared between three O atoms. Since higher the bond order shorter teh bond THEREFORE N-O bond is `NO_(2)^(-)` is shorter than N-O bond in `NO_(3)^(-)` |
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