Define the following
i) Recemic mixture
ii) Retention of configuration
iii) Enantiomers

i) Recemic mixture : It is an equimolar mixture of dextro and laevo forms of an optically active compound
Eg: (d, l) 2-chlorobuatane
ii) Retention configuration : Retention of configuration is the preservation of the spatial arrangement of bonds to asymmetric centre during a chemical reaction (or) transformation.
iii) Enantiomeres: Enantiomeres are stereoisomers related to each other as non superimposable mirror images.