Give the IUPAC name for each of the following:

b.

What does the term 'aromatic' refer to when discussing organic molecules?

What is resonance and why is it important in aromatic compounds?

Determine the systematic name of the molecule. 

Write a common name for the following compound.

The common name for a disbstituted benzene with two methyl groups is xylene. Draw a structure for meta-xylene.

Write an IUPAC name for the following compound.

Draw a structure for 3-chloro-2-ethyl-6-nitrotoluene.