Question

Increasing rate of $S_{N}1$ reaction for the following compounds is:

• A. I < II < III < IV
• B. II < I < III < IV
• C. I < II < IV < III
• D. II < I < IV < III

Answer 1

The correct option is B II < I < III < IV

More stable carbocation intermediates, higher will be the rate for $S_{N}1$ reaction.
The electronic effects by the substituents on the carbocation formed are as follow: