Quiz - Stereoisomers - 2 | Stereoisomers
Organic Chemistry 1 - Quiz - Stereoisomers - 2
What is not one of the characteristics of a chiral molecule?
The superimposability of a molecule on its mirror image indicates it is achiral, which is the opposite of what defines chirality. Chiral molecules are non-superimposable on their mirror images.
When assigning absolute configurations to chiral centers in a molecule, two enantiomers will have:
Enantiomers are non-superimposable mirror images of each other; therefore, all chiral centers will have opposite R and S configurations in two enantiomers.
Which of the following is true about a pair of diastereomers?
Diastereomers are stereoisomers that are not mirror images and therefore have different physical and chemical properties.
What is the result of plane-polarized light passing through a solution containing a racemic mixture?
A racemic mixture contains equal amounts of two enantiomers, which rotate plane-polarized light in equal and opposite directions, resulting in no net rotation.
Which characteristic is unique to meso compounds among stereoisomers?
Meso compounds have multiple chiral centers but have an internal plane of symmetry, making them achiral overall.
A non-racemic mixture with an excess of one enantiomer will exhibit:
The observed optical rotation is proportional to the difference in concentration between the enantiomers, known as the enantiomeric excess.
What is a key difference between enantiomers and diastereomers?
The key difference is that enantiomers are non-superimposable mirror images, whereas diastereomers are not.
Which statement best represents the relationship between meso compounds and chirality?
The inherent symmetry in meso compounds cancels out the chirality of individual chiral centers, making them achiral.
What property is used to quantify enantiomeric excess?
Enantiomeric excess is quantified by measuring the optical rotation angle, which reflects the excess of one enantiomer over the other.
What does the term "specific rotation" measure in the context of optical activity?
Specific rotation is a measure of the angle through which polarized light is rotated as it passes through a chiral substance.