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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb152

Which of the following hydrocarbons has a zero dipole moment?

  1. Apropadiene ()
  2. Bpropyne
  3. Cpropene
  4. Dchloroethene

Answer: A

In propadiene the two terminal planes are mutually perpendicular and the molecule has symmetry, so the dipole is zero. Propene, propyne and chloroethene have a net dipole moment.
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