Which of the following has an achiral stereoisomer?
a. 2,3-dichlorobutane
b. 2,3-dichloropentane

검증된 단계별 안내

Step 1: Understand the concept of chirality. A molecule is chiral if it has a non-superimposable mirror image, typically due to the presence of a carbon atom bonded to four different groups. An achiral molecule, on the other hand, has a plane of symmetry or a center of symmetry, making it superimposable on its mirror image.

Step 2: Analyze the structure of 2,3-dichlorobutane. Draw the molecule and identify the stereocenters (chiral carbons). In this case, carbons 2 and 3 are stereocenters because they are bonded to four different groups.

Step 3: Determine if 2,3-dichlorobutane can have an achiral stereoisomer. Check for the possibility of a meso compound, which is an achiral molecule despite having stereocenters. A meso compound occurs when the molecule has an internal plane of symmetry that makes it superimposable on its mirror image.

Step 4: Repeat the analysis for 2,3-dichloropentane. Draw the molecule, identify the stereocenters (carbons 2 and 3), and check for the presence of an internal plane of symmetry that could result in a meso compound.

Step 5: Compare the findings for both molecules. Determine which molecule has an achiral stereoisomer (a meso form) based on the presence of an internal plane of symmetry. This will help you identify the correct answer.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Chirality

Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image. A chiral molecule typically has at least one carbon atom bonded to four different substituents, resulting in two distinct enantiomers. Understanding chirality is crucial for identifying stereoisomers and their properties.

Stereoisomers

Stereoisomers are compounds that have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of their atoms. This category includes enantiomers, which are non-superimposable mirror images, and diastereomers, which are not mirror images. Recognizing the types of stereoisomers is essential for determining the presence of achiral forms.

Achirality

Achirality describes molecules that are superimposable on their mirror images, meaning they do not exhibit chirality. A molecule can be achiral if it has a plane of symmetry or if it lacks chiral centers. Identifying achiral stereoisomers is important in organic chemistry, as it influences the reactivity and properties of the compounds.

Which of the following has an achiral stereoisomer? a. 2,3-dichlorobutane b. 2,3-dichloropentane