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What is Resonance structure ? Why the resonances structure required explain with' suitable example.OR Give resonance of O_(3) , its requirement, delimitation and advantages |
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Answer» SOLUTION :Resonance STRUCTURES : Different Lewi , structure of single molecule / ion is KNOWN as resonance structure. According to the concep of resonance, whenever a single Lewis structure cannot describe a molecule accurately so mor than one Lewis structure means resonance structure describe. Resonance structure of ozone `(O_(3))` : To draw resonance structure the position of nucleus of atom is not change. Every reasons structure the position of bonding and non-bonding electron is change but Lewis structure is not seen different. ·The different resonance structure is represented by a double HEADED arrow. All resonance structure are similar energy. Two resonance structure of `O_(3)` molecule (I) and (II) and (III) is resonance hybrid.  Limitation of resonance : Any one is not seen right structure. The O- O bond length is 148 and O = O bond length is 121 pm. Thus single and double bond length is not experimentally present in `O_(3)` . `therefore ` Correct structure of `O_(3)` is not (I) and (II) Resonance : Correct structure is resonance hybrid. Experimentally determined oxygen - oxygen (0 - 0) bond length in the `O_(3)` molecule are same 128 pm. So, (III) is a real or accurate structure of `O_(3)` in which single and double bond is not stable. Resonance structure are necessary because it GIVES correct different Lewis structure. Orientation : Single assumption structure can.t give correct bond length & bond energy. Advantage : It gives assumption of correct structure. |
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