Options:
1. 2-Chloropropane (Not chiral, lacks a chiral center).
2. 2-Chloro-2-methylbutane (Not chiral, no four different groups on carbon).
3. 3-Chloro-3-methylbutane (Not chiral, symmetry exists).
4. 2-Chloropentane (Chiral, contains a chiral center at C-2). Answer: Option 4: 2-Chloropentane.