問題詳情

11. A pure sample of (S)-phenylalanine has a specific rotation of +70o. A mixture of the two enantiomers of phenylalaninegives a specific rotation of -7.0o. What are the percentages of the S and R enantiomers in the mixture?
(A) 75 % S, 25 % R
(B) 65 % S, 35 % R
(C) 55 % S, 45 % R
(D) 45 % S, 55 % R
(E) 35 % S, 65 % R

參考答案

答案:D
難度:適中0.4
統計:A(0),B(0),C(2),D(2),E(1)

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