問題 8

Which haloalkane undergoes nucleophilic substitution primarily via the $\text{S}_\text{N}1$ mechanism?

1. Chloromethane ($\text{CH}_3\text{Cl}$)
2. 1-Chloropropane ($\text{CH}_3\text{CH}_2\text{CH}_2\text{Cl}$)
3. 2-Chloro-2-methylpropane ($(\text{CH}_3)_3\text{C-Cl}$)
4. Chloroethane ($\text{CH}_3\text{CH}_2\text{Cl}$)