An `S_(N)2` reaction at an asymmetric carbon of a compound always gives

Options

A. an enantiomer of the substance
B. a product with opposite optical rotation
C. a mixture of diastereomers
D. a single stereoisomers

Explanation

In `S_(N)2` reaction, inversion of configuration occurs. Since the reactant and the product are not enantiomers, the sign of optical rotation may or may not change hence single stereoisomer is obtained.