CBSE 2025, Set 2

Question

Define the following:

(i) Enantiomers

(ii) Racemic mixture

Edvaya · Accepted Answer

The correct answer is Subjective. **(i) Enantiomers:** Stereoisomers that are **non-superimposable mirror images** of each other. They have identical physical properties (melting point, boiling point, solubility) except they rotate plane-polarised light in opposite directions (one is dextrorotatory (+), the other is laevorotatory (−)). **Example:** D-(+)-lactic acid and L-(−)-lactic acid are enantiomers. **(ii) Racemic Mixture:** A mixture containing **dextrorotatory (+) and laevorotatory (−) enantiomers in equal proportions** (50:50). A racemic mixture has no net optical rotation and is optically inactive. It is also called a racemate and is denoted as (±) or dl. **Example:** A racemic mixture of (R)- and (S)-2-bromobutane shows no optical activity.

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Chemistry > Organic Chemistry > Haloalkanes And Haloarenes

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