What is IUPAC name of propylene glycerol?

What is IUPAC name of propylene glycerol?
  1. Propane-1,2-diol
  2. Propane-1,3-diol
  3. Propane-1,2,3-triol
  4. Propene-1,2,3-triol

Asked in: MHT CET 2023 (09 May Shift 2)

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