<prompt> The conversion of optically pure isomer enantiomer into a mixture of equal amounts of both dextro and levo forms is called asPolymerizationStereoisomerizationRacemizationFractionation  <response>: Depending on the rotation, molecules are called dextrorotatory d or levorotatory - l. Thus D-glucose is dextrorotatory but D-fructose is levorotatory. Equimolecular mixture of optical isomers has no net rotation racemic mixture or Racemization Ref: Textbook of Biochemistry for Medical Students, 7E DM Vasudevan2013 Pg no.70 71. 