When a halogenation reaction takes place at that chiral center, the product obtained is a racemic mixture.
What is a racemic mixture?
- A chemical substance that has equal amounts of left- and right-handed enantiomers of a chiral molecule is called as a racemic mixture.
- The first known racemic mixture was racemic acid, which Pasteur found to be a mixture of the two enantiomeric isomers of tartaric acid. A sample with only one enantiomer is an enantiomerically pure or enantiopure compound.
- A racemate is optically inactive (achiral), meaning that there's no net rotation of plane-polarized light.
- Although the 2 enantiomers rotate plane-polarized light in opposite directions, the rotations cancel one another out because they are present in equal amounts of negative (-) counterclockwise (levorotatory) and positive (+) clockwise (dextrorotatory) enantiomers.
- In contrast to the 2 pure enantiomers, which have identical physical properties apart from the direction of rotation of plane-polarized light, a racemate sometimes has different properties from either of the pure enantiomers.
- Different melting points are commonest , but different solubilities and boiling points also are possible.
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