A racemic mixture is:
AA 50:50 mixture of two enantiomers, which is optically inactive because the rotations cancel out
BA mixture of two diastereomers
CA pure dextrorotatory compound
DA 50:50 mixture of an alcohol and its halide
Answer & Solution
Correct answer: A. A 50:50 mixture of two enantiomers, which is optically inactive because the rotations cancel out
**Racemic mixture (dl- or (±)-)** = equal amounts of d and l enantiomers. Net optical rotation = 0 (each enantiomer's rotation cancels the other). **Racemisation** = converting a single enantiomer to the racemic mixture (e.g., in SN1 reactions).
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