Question

The following reaction is described as

• A. $S_{N}2$
• B. $S_{N}i$
• C. $S_{E}2$
• D. $S_{N}1$

Answer 1

The correct option is A $S_{N}2$

$S_{N}2$ reaction are bimolecular reactions where rate of reaction depends on the concentration of both substrate and nucleophile. When $O{H}^{-}$ attacks the substrate from the opposite side of the leaving group $i.e.,B{r}^{-}$ a transition state result, to which both $OH$ and $Br$ are partially bonded to carbon atom.