A mixture containing equimolar quantities of a pair of enantiomers is called a RACEMIC MIXTURE. A racemic mixture is represented as (+) or sometimes dl, e.g. (±)-glucose or d glucose. A racemic mixture is optically inactive. 20. How is the racemic mixture of alanine represented?

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A mixture containing equimolar quantities of a pair of enantiomers is called a RACEMIC
MIXTURE. A racemic mixture is represented as (+) or sometimes dl, e.g. (+)-glucose or dt
glucose. A racemic mixture is optically inactive.
20. How is the racemic mixture of alanine represented?
Transcribed Image Text:A mixture containing equimolar quantities of a pair of enantiomers is called a RACEMIC MIXTURE. A racemic mixture is represented as (+) or sometimes dl, e.g. (+)-glucose or dt glucose. A racemic mixture is optically inactive. 20. How is the racemic mixture of alanine represented?
For example, alanine is a chiral amino acid that has two enantiomers: (+)-alanine and (-)-alanine.
These two are optical isomers.
NH2
NH2
4.
One of the most important properties of chiral
molecules in solution is their effect on plane-
polarized light, this effect is called optical activity.
-C H
2
COOH
HOOC
CH
When an enantiomer rotates a plane-polarized light
in the positive direction or clockwise, it is
dextrorotary (+ or d), while for a negative direction
or counterclockwise, it is levorotary (- or l)
(+)-Alanine
(-)-Alanine
Alanine is a chiral amino acid that has two
enantiomers: (+)-alanine and ()-alanine. These two are
optical isomers.
Transcribed Image Text:For example, alanine is a chiral amino acid that has two enantiomers: (+)-alanine and (-)-alanine. These two are optical isomers. NH2 NH2 4. One of the most important properties of chiral molecules in solution is their effect on plane- polarized light, this effect is called optical activity. -C H 2 COOH HOOC CH When an enantiomer rotates a plane-polarized light in the positive direction or clockwise, it is dextrorotary (+ or d), while for a negative direction or counterclockwise, it is levorotary (- or l) (+)-Alanine (-)-Alanine Alanine is a chiral amino acid that has two enantiomers: (+)-alanine and ()-alanine. These two are optical isomers.
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