The R and S enantiomers of an optically active compound...

The $\mathrm{R}$ and $\mathrm{S}$ enantiomers of an optically active compound differs in
(a) their optical rotation of plane polarized light
(b) their reactivity with a chiral reagents
(c) their solubility in achiral reagents
(d) their melting points

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Key Concepts

Enantiomers

Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. Despite having the same molecular formula and connectivity, their spatial arrangements differ in such a way that they cannot be brought into alignment, which is the source of many of their distinctive properties.

Optical Activity

Optical activity is the property of chiral substances to rotate plane-polarized light. Enantiomers display equal but opposite optical rotations due to their mirror-image structures, making this one of the primary methods for differentiating between them.

Interactions with Chiral Reagents

Although enantiomers have nearly identical physical properties in achiral environments, they can interact differently with chiral reagents. These differential interactions can lead to variations in reaction outcomes, such as forming diastereomeric complexes that have distinct physical or chemical properties.

Physical Properties in Achiral Environments

In an achiral environment, enantiomers typically exhibit identical physical properties such as melting points, boiling points, and solubility. This identity results from their mirror-image structures having the same energy levels and interactions when in an achiral setting.

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