Question

An incorrect statement with respect to $S_{N}1$ and $S_{N}2$ mechanism for alkyl halide is :

• A. competing reaction for an $S_{N}2$ reaction is rearrangement
• B. a weak nucleophile and a protic solvent increases the rate or favours $S_{N}1$ reaction
• C. a strong nucleophile in an aprotic solvent increases the rate or favours $S_{N}2$ reaction
• D. $S_{N}1$ reactions can be catalysed by some Lewis acids

Answer 1

The correct option is A competing reaction for an $S_{N}2$ reaction is rearrangement

$S_{N}2$ reaction does not involve rearrangement as it is a concerted one step reaction. However, $S{N}^1$ undergoes rearrangement reaction.

Option A is an incorrect statement.