8. Which molecule below has a significant band in the 1720-1780 cm-1 range of its IR spectrum? (A) CH3CH2CH₂OH (B) CH3C=CCH2CH3 (C) CH3CH2CH(NH2)CH3 (D) (CH3)3N(E) CH3CO₂CH2CH3

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.

8. Which molecule below has a significant band in the 1720-1780 cm^-1 range of its IR spectrum?
(A) CH₃CH₂CH₂OH
(B) CH₃C=CCH₂CH₃
(C) CH₃CH₂CH(NH₂)CH₃
(D) (CH₃)₃N
(E) CH₃CO₂CH2CH₃

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