Question

Which of the following reaction mechanism will be faster in rate?

• A. $S_{N}1$
• B. $S_{N}2$
• C. $S_{N}NGP$
• D. Both (a) and (b)

Answer 1

The correct option is C $S_{N}NGP$

When a two reacting group are present in the same molecule, then the reaction between them is intramolecular.

When a two reacting group are present in separate molecules, then the reaction between them is intermolecular.

Intramolecular reactions are faster.

Both $S_{N}1$ and $S_{N}2$ are intermolecular reaction but $S_{N}NGP$ is an intramolecular reaction. Hence, rate of reaction will be higher for $S_{N}NGP$ reaction mechanism.