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A tertiary alkyl halide like t-butyl bromide in aqueous ethanol on the bench gives a racemic mixture because:
ASN2 proceeds with strict inversion at the chiral centre
BTwo products with opposite chirality form via E2 elimination
CSN1 carbocation intermediate is planar, attacked from both faces
DAqueous ethanol prevents any reaction by stabilising R-X
Answer & Solution
Correct answer: C. SN1 carbocation intermediate is planar, attacked from both faces
SN1 carbocation intermediate is planar (sp$^2$); nucleophile attacks both faces equally, giving racemic mix.
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