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A molecule that is non-superimposable on its mirror image is called:
AChiral
BTautomer
CDiastereomer
DAchiral
Answer & Solution
Correct answer: A. Chiral
**Chiral** = non-superimposable on its mirror image (like left/right hands). A chiral molecule is optically active (rotates plane-polarised light). Most often arises from an **asymmetric carbon** (sp³ C with 4 different groups attached). **Achiral** = superimposable on mirror image, optically inactive.
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