12.3

Sure, let's decode what the problem is asking for in the questions 12.1 and 12.2:

12.1

You need to identify the following aromatic compounds. It seems like they may be asking for you to name the given structures.

12.2

For these, you're supposed to determine structural formulas of possible isomers for the given compounds, and then name them.

If you need help with naming or isomer identification, feel free to ask!