In terms of scent, how do enantiomers differ?

• A. They have different densities
• B. They differ in boiling points
• C. They may have different smells
• D. They exhibit unique IR spectra

Answer: (C)

Enantiomers are a type of stereoisomer that are mirror images of each other and cannot be superimposed. Although they have the same molecular formula and connectivity of atoms, their three-dimensional arrangement is different. This difference in spatial arrangement can lead to variations in how they interact with other chiral substances, including receptors in the olfactory system.

The key point is that enantiomers can bind to chiral receptors in the nose differently due to their distinct shapes, resulting in the perception of different smells. This phenomenon is crucial in fields like perfumery, where slight variations in molecular structure can significantly alter scent profiles. Therefore, it is accurate to say that enantiomers may have different smells due to their unique interactions with olfactory receptors.

While the other options mention properties such as density, boiling points, and infrared spectra, these properties do not fundamentally capture the essence of how enantiomers are perceived olfactorily. Differences in density and boiling points among enantiomers are typically negligible, as they are often very similar in these physical properties due to their identical molecular formulas. Similarly, while enantiomers might have distinct IR spectra due to differences in molecular conformation, this does not directly relate to their olfactory characteristics. Thus, the