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8. A pure sample of the S enantiomer of a compound has specific rotation, [a], of +100°. A solution containing 0.20 g/mL of a mixture of the two enantiomers of the compound rotates plane polarized light by -16° in a 1 dm polarimeter. What is the enantiomeric excess (% ee) of the mixture? A) 32% S B) 80% S C) 80% R D) 16% R E) 16% S 9. How many chiral centers are there in the following molecule? (The naturally occuring stereoisomer with this structure is cortisol.) A) 5 B) 6 C) 7 D) 8 HO HO .OH E) 9

8. A pure sample of the S enantiomer of a compound has specific rotation, [a], of +100°. A solution containing 0.20 g/mL of a mixture of the two enantiomers of the compound rotates plane polarized light by -16° in a 1 dm polarimeter. What is the enantiomeric excess (% ee) of the mixture? A) 32% S B) 80% S C) 80% R D) 16% R E) 16% S 9. How many chiral centers are there in the following molecule? (The naturally occuring stereoisomer with this structure is cortisol.) A) 5 B) 6 C) 7 D) 8 HO HO .OH E) 9

Organic Chemistry: A Guided Inquiry
Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter12: Chirality
Section: Chapter Questions
Problem 27CTQ
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8. A pure sample of the S enantiomer of a compound has specific rotation, [a], of +100°. A solution containing 0.20 g/mL of a mixture of the two enantiomers of the compound rotates plane polarized light by -16° in a 1 dm polarimeter. What is the enantiomeric excess (% ee) of the mixture? A) 32% S B) 80% S C) 80% R D) 16% R E) 16% S 9. How many chiral centers are there in the following molecule? (The naturally occuring stereoisomer with this structure is cortisol.) A) 5 B) 6 C) 7 D) 8 HO HO .OH E) 9
Transcribed Image Text:8. A pure sample of the S enantiomer of a compound has specific rotation, [a], of +100°. A solution containing 0.20 g/mL of a mixture of the two enantiomers of the compound rotates plane polarized light by -16° in a 1 dm polarimeter. What is the enantiomeric excess (% ee) of the mixture? A) 32% S B) 80% S C) 80% R D) 16% R E) 16% S 9. How many chiral centers are there in the following molecule? (The naturally occuring stereoisomer with this structure is cortisol.) A) 5 B) 6 C) 7 D) 8 HO HO .OH E) 9
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