Enantiomerism
A pair of compound or species those are NON-SUPERIMPOSABLE mirror image to each others are called Enantiomers. Enantiomers have same physical and chemical property but different optical properties towards plane polarized light.They can't be seperated by evaporation or fractional distillation .
Enantiomerism is a relationship between two stereoisomers. Enantiomers have identical but opposite θ value (SPECIFIC ROTATION). Enantiomers have opposite notation also.
Example 1 :
R & S Bromochlorofluoroiodomethane :This molecule has one chiral carbon and its mirror image is nonsuperimposable.
Example 2 :
R & S-2-Butanol : This molecule has one chiral carbon and its mirror image is nonsuperimposable.
Example 3 :
R & S Bromochlorofluoromethane : This molecule has one chiral carbon and its mirror image is nonsuperimposable.
Example 4 :
R & S Dichlorocyclopropane : This molecule has two identical chiral carbon and therefore three possible stereoisomers RR,RS and SS.RR and SS are mirror image to each other but nonsuperimposable hence form enantiomeric pair.
Example 5 :
R,R & S,S- Butanediol : This molecule has two identical chiral carbon and therefore three possible stereoisomers RR,RS and SS. RR and SS are mirror image to each other but nonsuperimposable hence form enantiomeric pair.