23. Which ofthe following is a vicinal dihalide?(A) cis-1,2-dibromocyclopentane(B) 3,3-dichloropentane(C) trans-1,4-diiodocyclohexane(D) isobutyl chloride(E) 1,3-dibromoheptane

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.

23. Which ofthe following is a vicinal dihalide?
(A) cis-1,2-dibromocyclopentane
(B) 3,3-dichloropentane
(C) trans-1,4-diiodocyclohexane
(D) isobutyl chloride

(E) 1,3-dibromoheptane

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