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how we can determine the resonance of series of compounds?


6 years ago


Answers : (1)


Dear student,

Resonance or mesomerism is a way of describing delocalised electrons within certain molecules where the bonding cannot be expressed by one single Lewis formula. A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical forms).

Each contributing structure can be represented by a Lewis structure, with normal single, double or triple covalent bonds between every pair of adjacent atoms within the structure. These individual contributors cannot be observed in the actual resonance-stabilized molecule; resonance is not a rapidly-interconverting set of contributors. Several Lewis structures are used collectively to describe the actual molecular structure. The actual structure is an approximate intermediate between the canonical forms, but its overall energy is lower than each of the contributors. This intermediate form between different contributing structures is called a resonance hybrid. Contributing structures differ only in the position of electrons, not in the position of nuclei.
Resonance is a key component of Valence bond theory.


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Sagar Singh

B.Tech IIT Delhi

6 years ago

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