Question
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Diastereomers are achiral molecules have superposable mirror images.
Reason (R) : Diastereomers are compounds have different physical properties.
In the light of the above statements, choose the most appropriate answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
(A) is not correct but (R) is correct
Diastereomers Assertion and Reason Analysis
Assertion (A) Evaluation
Assertion (A) claims that diastereomers are achiral molecules with superposable mirror images.
- Diastereomers are stereoisomers that are not mirror images of each other.
- Achiral molecules are molecules that are identical to their mirror images (superposable).
- The assertion incorrectly links the definition of diastereomers with the properties of achiral molecules. Diastereomers are distinct compounds and are generally chiral, while having superposable mirror images is the definition of being achiral.
- Therefore, Assertion (A) is factually incorrect.
Reason (R) Evaluation
Reason (R) states that diastereomers are compounds possessing different physical properties.
- Diastereomers are stereoisomers that are not mirror images. Being non-mirror images means they are fundamentally different chemical compounds.
- Different chemical compounds, by definition, exhibit different physical properties (e.g., boiling point, melting point, solubility). This contrasts with enantiomers, which are mirror images and share identical physical properties.
- Therefore, Reason (R) is correct.
Final Conclusion
Since Assertion (A) is incorrect and Reason (R) is correct, the appropriate choice is the one that reflects this assessment.
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