Question

For the given pair of $S_{N}1$ reactions, the ______ reaction is faster.

• A. first
• B. second
• C. both progress at the same rate
• D. cannot be determined

Answer 1

The correct option is A first

The given pair of $S_{N}1$ reactions, the first reaction in $S_{N}1$ reaction is faster because, after heterolysis of $C-Br$ bond, the primary carbocation formed undergoes rearrangement via hydride shift which leads to the formation of a more stable tertiary carbocation.