How might you use ¹³C NMR spectroscopy to differentiate between the possible ortho, meta, and para products of the electrophilic aromatic substitution reaction shown?

Addition by the benzyne mechanism is not usually regioselective. Explain the fact that the reaction shown is highly regioselective for the product shown.

Suggest an arrow-pushing mechanism of the following rearrangement.

Suggest a synthesis of the molecule on the right beginning with the molecules on the left.