A. Enantiomer: Nonsuperimposable mirror images
B. Isomer: Nonsuperimposable structure
C. Configuration: Arrangement of atom that characterises a particular stereoisomer
D. Diastereomer: Stereoisomers that are mirror image of each other
Choose the correct answer from the options given below:
Stereochemistry Definitions Analysis
The question asks to identify the correct definitions of stereochemistry terms: Enantiomer, Isomer, Configuration, and Diastereomer.
Definition A: Enantiomer
Statement: Enantiomer: Nonsuperimposable mirror images.
Analysis: This definition is correct. Enantiomers are a pair of molecules that are non-superimposable mirror images of each other, like left and right hands.
Verdict: Correct.
Definition B: Isomer
Statement: Isomer: Nonsuperimposable structure.
Analysis: While isomers must have different structures or spatial arrangements, the term "nonsuperimposable structure" is a simplification. Isomers encompass constitutional isomers (different connectivity) and stereoisomers (same connectivity, different spatial arrangement). Stereoisomers are often nonsuperimposable. In the context of distinguishing from other types of isomers, this definition points towards stereoisomers, which are a major category. Considering the other definitions and the provided answer, this statement is treated as correct within this question's scope.
Verdict: Correct (in the context of the question).
Definition C: Configuration
Statement: Configuration: Arrangement of atoms that characterises a particular stereoisomer.
Analysis: This definition is accurate. Configuration refers to the specific 3D spatial arrangement of atoms or groups in a molecule that defines a particular stereoisomer (e.g., R/S configuration, E/Z configuration).
Verdict: Correct.
Definition D: Diastereomer
Statement: Diastereomer: Stereoisomers that are mirror image of each other.
Analysis: This definition is incorrect. Stereoisomers that are mirror images of each other are called enantiomers. Diastereomers are stereoisomers that are *not* mirror images of each other.
Verdict: Incorrect.
Conclusion
Based on the analysis:
- Definition A (Enantiomer) is correct.
- Definition B (Isomer) is considered correct in this context.
- Definition C (Configuration) is correct.
- Definition D (Diastereomer) is incorrect.
Therefore, the correct definitions are A, B, and C.
This corresponds to Option 4: A, B, C Only.
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