I sincerely apologize for delaying the answers to the quiz proposed in the ‘2D Molecules that Form Our 3D World‘ post. (I have been scrambling preparing for chemistry conference season and helping design sloth t-shirts for Women Thinking, inc.) If you still haven’t read the post and taken a stab at the questions, then check it out before reading below the fold. Congratulations to commenter notidealist for being the first and only commenter to correctly answer the quiz.
The answers to the post are:
The resonance structures make each one of these a bit clearer that it is aromatic or anti-aromatic. Try ‘pushing’ the electrons to get a clearer view.