A mixture containing two enantiomers in equal proportions
will have zero optical rotation, as the rotation due to one isomer
will be cancelled by the rotation due to the other isomer Such
a mixture is known as racemic mixture or racemic
modification A racemic mixture is represented by prefixing dl
or (±) before the name, for example (±) butan-2-ol The process
of conversion of enantiomer into a racemic mixture is known as
racemisation