Garlic Garlic contains the molecule alliin (Figure P 9.143 ). When garlic is crushed or chopped,

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Garlic Garlic contains the molecule alliin (Figure P 9.143...

Garlic Garlic contains the molecule alliin (Figure $\mathrm{P} 9.143$ ). When garlic is crushed or chopped, a reaction occurs that converts alliin into the molecule allicin, which is primarily responsible for the aroma we associate with garlic. a. Describe the molecular geometry about the sulfur atoms in both compounds. b. Do any of the sulfur atoms in allicin have the same geometry as the sulfur atoms in the volatile sulfur compounds that cause bad breath $\left(\mathrm{H}_{2} \mathrm{S}, \mathrm{CH}_{3}-\mathrm{SH}$, \right. and $\left.\mathrm{CH}_{3}-\mathrm{S}-\mathrm{CH}_{3}\right) ?$ (FIGURE CAN'T COPY)

Garlic Garlic contains the molecule alliin (Figure $\mathrm{P} 9.143$ ). When garlic is crushed or chopped, a reaction occurs that converts alliin into the molecule allicin, which is primarily responsible for the aroma we associate with garlic.
a. Describe the molecular geometry about the sulfur atoms in both compounds.
b. Do any of the sulfur atoms in allicin have the same geometry as the sulfur atoms in the volatile sulfur compounds that cause bad breath $\left(\mathrm{H}_{2} \mathrm{S}, \mathrm{CH}_{3}-\mathrm{SH}$, \right. and $\left.\mathrm{CH}_{3}-\mathrm{S}-\mathrm{CH}_{3}\right) ?$
(FIGURE CAN'T COPY)

Key Concepts

Molecular Geometry

Molecular geometry describes the three-dimensional arrangement of atoms within a molecule, which is determined by the number of bonding pairs and lone pairs of electrons surrounding a central atom. Understanding molecular geometry is essential for predicting physical properties and reactivity, as it explains shapes like linear, bent, trigonal planar, tetrahedral, and trigonal pyramidal, among others.

VSEPR Theory

The Valence Shell Electron Pair Repulsion (VSEPR) theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs around a central atom. By considering both bonding and non-bonding (lone) electron pairs, VSEPR theory explains the deviations from idealized geometries in molecules with different numbers of electron domains.

Stereochemistry of Sulfur-Containing Functional Groups

Sulfur atoms can participate in various functional groups and exhibit differing geometries based on their bonding environments and oxidation states. For example, in sulfoxide or thiosulfinate groups, the bonding and presence of lone pairs on the sulfur atom can result in geometries that are distinct from those in simpler sulfur compounds. Recognizing these differences is crucial when comparing complex molecules to simpler volatile sulfur compounds.

Geometry in Volatile Sulfur Compounds

Volatile sulfur compounds, such as those responsible for bad breath (e.g., H2S, CH3SH, CH3SCH3), typically display geometries influenced by the number of bonded atoms and lone pairs on the sulfur atom. These molecules often have structures such as bent or trigonal pyramidal geometries due to lone pair–bond pair repulsion, which affects the overall shape and, consequently, their chemical properties.

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