Question

Does resonance occurs when more than one valid Lewis structure can be written for a molecule?

Answer 1

Yes, resonance occurs when only one Lewis structure is not sufficient to describe the bonding of other atoms and the position of electrons in a molecule.

Explanation:

However, it is important to note that the actual structure of a molecule is not within the resonance in which it exists, in state, it's a hybrid of all the resonance structure in which we are able to draw for a particular molecule.

Note that practice is essential to master this concept

On that note:

http://leah4sci.com/resonance-structures-organic-chemistry-practice-quiz/