Determine whether the molecules in each pair are the same or enantiomers. c.

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Identify the molecular formula for each molecule in the pair to ensure they are the same.

Examine the three-dimensional arrangement of atoms in each molecule. Look for chiral centers, which are carbon atoms bonded to four different groups.

Determine the configuration (R or S) of each chiral center in both molecules using the Cahn-Ingold-Prelog priority rules.

Compare the configurations of the chiral centers in both molecules. If all configurations are the same, the molecules are the same; if they are mirror images with opposite configurations at every chiral center, they are enantiomers.

If the molecules have different molecular formulas or different connectivity of atoms, they are neither the same nor enantiomers.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molecular Structure

Molecular structure refers to the arrangement of atoms within a molecule, including the connectivity and spatial orientation of these atoms. Understanding molecular structure is crucial for determining whether two molecules are identical or different, as even slight variations in arrangement can lead to distinct chemical properties.

Stereoisomerism

Stereoisomerism is a form of isomerism where molecules have the same molecular formula and connectivity but differ in the spatial arrangement of atoms. Enantiomers are a specific type of stereoisomers that are non-superimposable mirror images of each other, which is essential for understanding the differences between molecules in the given pairs.

Chirality

Chirality is a property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. A chiral molecule typically has at least one carbon atom bonded to four different substituents, leading to the formation of two enantiomers. Recognizing chirality is vital for determining whether the molecules in question are the same or enantiomers.