Question #c7457

1 Answer
Hina
Jan 16, 2018

Basically Resonance is the representation of real structure of a compound as a weighted average two r more forms.

Explanation:

When two r more Lewis structure can b written for a compound the structures are called resonance contributing structure.

While the resonance effect or mesomemric effect is the decrease is electron density at one position nd corresponding increase in electron density at another position in conjugated system.
It may be +M or +R nd -R or-M
Atoms r group which donate electrons towards carbon atom are said to be +M effect. Like u can take example of Br. _NH2, -OH , -OR

while which draw electrons away from a carbon are said to be -Me or -R
Like -NO2, -CN, -COOR, -COOH etc

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