An amine A has the molecular formula C7H9N. Compound A reacts with benzenesulfo-nyl chloride in aqueous potassium hydroxide to give a clear solution; acidification of the solution gives a precipitate. When A is treated with NaNO2 and HCl at 0-5 oC, and then with 2-naphthol, an intensely colored compound is formed. Compound A gives a single strong IR absorption peak at 815 cm-1. What is the structure of A?