Halogenoalkanes undergo reaction with aqueous NaOH to form alcohols. The mechanism involved is either $\mathrm{S_N1}$ or $\mathrm{S_N2}$. Which halogenoalkane gives the greatest percentage of product through an $\mathrm{S_N1}$ mechanism when it is treated with aqueous NaOH?
- A2-bromopropane
- B2-chloropropane
- C1-iodo-2-methylpropane
- D2-iodo-2-methylpropane