A is
A)
B)
C) \[1:1\] mixture of both (a) and (b)
D) \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\]
Correct Answer: B
Solution :
The \[{{S}_{{{N}^{2}}}}\] reactions of alkyl halides are concerted reactions, \[i.e.,\] take place in one step. These occur through a transition state in which both the reactants are partially bonded to each other, the attack of the nucleophile (i.e., \[O{{H}^{-}}\] ion) occurs from the back side and the leaving group (i.e., \[B{{r}^{-}}\] ion) leaves from the front side. As a result, the \[{{S}_{{{N}^{2}}}}\] reactions of optically active alkyl halides are always accompanied by inversion of configuration at the asymmetric centre, which is also known as Walden inversion and the products are not enantiomers.
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