Chirality and Optical Activity
Chemistry ⇒ Carbon and Organic Chemistry
Chirality and Optical Activity starts at 11 and continues till grade 12.
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A compound has three chiral centers. What is the maximum number of stereoisomers possible?
A sample of a chiral compound has a specific rotation of –10°. What does the negative sign indicate?
A solution contains 70% of the (+) enantiomer and 30% of the (–) enantiomer. What is the enantiomeric excess?
Assign the R or S configuration to a chiral center if the priority order of the groups attached is: Br > OH > CH3 > H, and the lowest priority group (H) is pointing away from you, with the order Br → OH → CH3 going clockwise.
Define optical activity.
Describe the Cahn-Ingold-Prelog priority rules used in assigning R and S configurations.
Describe the difference between optical isomers and geometric isomers.
Explain why a meso compound is optically inactive despite having chiral centers.
Explain why enantiomers have different effects in biological systems.
Name the instrument used to measure optical rotation.
The specific rotation of a compound is +20°. If the observed rotation for a sample is +5°, what is the percentage of the (+) enantiomer in the sample, assuming the rest is the (–) enantiomer?
The specific rotation of a pure enantiomer is +25°. What is the specific rotation of its racemic mixture?
What is the difference between a chiral and an achiral molecule?
What is the minimum number of chiral centers required for a molecule to be chiral?
What is the relationship between enantiomers?
What is the term for a pair of stereoisomers that are not mirror images of each other?
