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The S N 2 reaction produces a racemic mixture of products, because the reaction proceeds through a carbocation. Halogens are in general good leaving groups. Triethyl amine is a better nucleophile than ammonia. The S N 2 reaction is affected by the nature of the leaving group, the effect of steric hinderance of the substrate, the strength of the nucleophile and the polarity of the solvent. Predict the principal product of each of the following reactions.