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ORGANIC CHEMISTRY: PRINCIPLES AND TECHNIQUES, Exams of Organic Chemistry

Stanford UniversityOrganic Chemistry

Which compound has an R configuration?-(a) CH3CH₂+B Which group has the highest priority using the Cahn, Ingold, Prelog rules?-(a) -C-OH Which of the following is optically inactive?-(a) a 50-50 mixture of R and S enantiomers, (c) every achiral compound If (S)-glyceraldehyde has a specific rotation of -8.7°, what is the specific rotation of (R)-glyceraldehyde?-(b) +8.7° What is a mixture of equal amounts of two enantiomers called?-(a) a racemic mixture What is the specific rotation of a mixture containing 75% of a pure isomer and 25% of the (-) isomer if the specific rotation of the pure substance is 1.68°?-(c) +1.26° What is the specific rotation of a solution containing 40% (-)-mandelic acid and 60% (+)-mandelic acid if (-)-mandelic acid has a specific rotation of -158°?-(b) +63° What is the relationship between the following compounds: CH3-CH3 and CH3-CHCl?-They are structural isomers

Typology: Exams

2025/2026

Available from 04/10/2026

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ORGANIC CHEMISTRY: PRINCIPLES AND TECHNIQUES|VERIFIED
ANSWERS100%|2025
Which compound has an R configuration?-✓✓(a) CH3CH₂+B
Which group has the highest priority using the Cahn, Ingold, Prelog rules?-✓✓(a) -C-
OH
Which of the following is optically inactive?-✓✓(a) a 50-50 mixture of R and S
enantiomers, (c) every achiral compound
If (S)-glyceraldehyde has a specific rotation of -8.7°, what is the specific rotation of
(R)-glyceraldehyde?-✓✓(b) +8.7°
What is a mixture of equal amounts of two enantiomers called?-✓✓(a) a racemic
mixture
What is the specific rotation of a mixture containing 75% of a pure isomer and 25%
of the (-) isomer if the specific rotation of the pure substance is 1.68°?-✓✓(c) +1.26°
What is the specific rotation of a solution containing 40% (-)-mandelic acid and 60%
(+)-mandelic acid if (-)-mandelic acid has a specific rotation of -158°?-✓✓(b) +63°
What is the relationship between the following compounds: CH3-CH3 and CH3-
CHCl?-✓✓They are structural isomers.

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ORGANIC CHEMISTRY: PRINCIPLES AND TECHNIQUES|VERIFIED

ANSWERS100%|

Which compound has an R configuration?-✓✓(a) CH3CH₂+B Which group has the highest priority using the Cahn, Ingold, Prelog rules?-✓✓(a) -C- OH Which of the following is optically inactive?-✓✓(a) a 50-50 mixture of R and S enantiomers, (c) every achiral compound If (S)-glyceraldehyde has a specific rotation of -8.7°, what is the specific rotation of (R)-glyceraldehyde?-✓✓(b) +8.7° What is a mixture of equal amounts of two enantiomers called?-✓✓(a) a racemic mixture What is the specific rotation of a mixture containing 75% of a pure isomer and 25% of the (-) isomer if the specific rotation of the pure substance is 1.68°?-✓✓(c) +1.26° What is the specific rotation of a solution containing 40% (-)-mandelic acid and 60% (+)-mandelic acid if (-)-mandelic acid has a specific rotation of -158°?-✓✓(b) +63° What is the relationship between the following compounds: CH3-CH3 and CH3- CHCl?-✓✓They are structural isomers.