15. Which of the following is aromatic?(A) cycloheptatrienyl cation (B) 1,3,5-hexatriene(C) cyclobutenyl anion(D) 1,3-cyclohexadiene(E) cyclopentadienyl cation

7. Predict the specific rotation of the compound shown.(A) It is impossible to predict; it must be determined experimentally.(B) Because both asymmetric centers are R, the compound is dextrorotatory.(C) Because both asymmetric centers are S, the compound is dextrorotatory.(D) Zero; the compound is achiral.(E) Because this compound represents a racemic mixture, the compound is dextrorotatory.

15. Which of the following is aromatic?
(A) cycloheptatrienyl cation
(B) 1,3,5-hexatriene
(C) cyclobutenyl anion
(D) 1,3-cyclohexadiene
(E) cyclopentadienyl cation

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