Organic Chemistry: Stereochemistry Flashcards
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Read the first 7 Organic Chemistry: Stereochemistry flashcards as text
When the lowest priority group points toward the viewer, the apparent rotation direction must be:
Answer: Reversed
If the lowest priority group faces you, you reverse the assigned rotation to get the correct R/S.
Which of the following is achiral?
Answer: Glycine (aminoacetic acid)
Glycine's alpha carbon bears two hydrogens, so it has no stereocenter and is achiral.
Diastereomers differ from enantiomers because diastereomers:
Answer: Have different physical properties
Diastereomers are not mirror images and therefore have different physical properties.
A compound with specific rotation [α] = 0 but containing stereocenters is most likely:
Answer: A meso compound or racemate
Zero rotation with stereocenters points to either a meso compound or a racemic mixture.
Converting a Fischer projection: horizontal lines represent bonds pointing:
Answer: Toward the viewer
In a Fischer projection, horizontal bonds point toward the viewer and vertical bonds point away.
Epimers are diastereomers that differ at:
Answer: Exactly one stereocenter
Epimers are diastereomers that differ in configuration at only a single stereocenter.
Which describes an optically inactive compound that can be separated into active forms?
Answer: Racemic mixture
A racemic mixture is optically inactive overall but can be resolved into its active enantiomers.