Provide the resonance structure including formal charges denoted in the illustration shown below. Which is the major contributor to the resonance hybrid of the compound shown?

Provide the two resonance structures for nitromethane, CH₃NO₂. Give the formal charge of the atoms in each structure (no need to show zero formal charges). 

Give all the possible resonance structures (some will not obey the octet rule) for pyrrole. Show the curve arrows to represent the conversion of one structure to another.

The skeleton of 1,2-difluorobenzene is given below

It has two fluorines replacing adjacent hydrogens in the ring. Does it have resonance structures? If yes, draw all of them.

Draw the resonance hybrid for the cyanate ion (OCN^–).

The SNO⁻ ion and the NSO⁻ ion are two simple ions from a large family of compounds called the NSO compounds. These compounds are mainly found in geological formations within asphaltenes and other mixtures. The SNO⁻ ion is more stable than the NSO⁻ ion. Draw Lewis structures for both ions including any resonance forms. Use formal charges to determine why SNO⁻ ion is more stable than the NSO⁻ ion.