Which one of the following has highest dipole moment?

Which one of the following has highest dipole moment?
  1. cis-but-2-ene
  2. trans-1, 2-dichloroethene
  3. cis-1, 2-dichloroethene
  4. trans-but-2-ene

Asked in: AP EAMCET 2018 (24 Apr Shift 1)

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