Question

Which of the following alkyl halide will undergo $S_{N}1$ reaction most readily?

• A. $(C{H}_3{)}_{3}C-F$
• B. $(C{H}_3{)}_{3}C-Cl$
• C. $(C{H}_3{)}_{3}C-Br$
• D. $(C{H}_3{)}_{3}C-I$

Answer 1

The correct option is D $(C{H}_3{)}_{3}C-I$

Since all the halides are $3^{\circ }$ halides , the rate of reaction will depend on the halogen group attached.
$\text{Rate of}{S}_{N}1\text{reaction}\propto \text{Leaving group ability}\text{Leaving group ability:}{F}^{-}<C{l}^{-}<B{r}^{-}<I^{-}$
Option (d) is the correct answer.