What is the IUPAC name of following compound?

What is the IUPAC name of following compound?
  1. 1-chloro-1,2-dimethylbut-2-ene
  2. 4-chloro-3,4-dimethylbut-2-ene
  3. 4-chloro-3-methylpent-2-ene
  4. 2-chloro-3-methylpent-3-ene

Asked in: MHT CET 2024 (04 May Shift 2)

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