Which one of the following compounds is optically active?

Which one of the following compounds is optically active?
  1. 2-Chloropentane
  2. 3-Chloropentane
  3. 2-Chloropropane
  4. 2-Chloro-2 methyl butane

Asked in: MHT CET 2020 (13 Oct Shift 1)

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