MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Aromatic molecules contain n electrons. A) 4n+ 2 (with n being an integer) B) unpaired C) no D) 4n (with n an integer) E) 4n+ 2 (with n being 0.5) 2) Which of the following compounds is aromatic? II I. III. II. III. A) I c) II D) IV 3) Which of the following is most likely to be the first step in the general mechanism for electrophilic substitution reactions? On A) I CH on-dore- IV. B) II NO2 V. IV. Oh -EV. 0. B) II D) IV 4) Which of the following is the electrophile that reacts with the aromatic ring during nitration? B) HNO3 A) 9) D) NO E) e NO2 E) V HE E) V e NO3