Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

→ 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.