A) a mixture of diastereomers
B) a single stereoisomer
C) an enantiomer of the substrate
D) a product with opposite optical rotation
Correct Answer: B
Solution :
In \[{{S}_{N}}2\] reactions, the nucleophile attaches itself from the direction opposite to that of the nucleophile already present in the second step, the previous nucleophile is removed and a single stereoisomer is obtained.
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