Which of the following does not show geometrical isomerism?

Which of the following does not show geometrical isomerism?
  1. 1, 2-dichloro - 1- pentene
  2. 1, 3 - dichloro - 2- pentene
  3. 1, 1- dichloro - 1- pentene
  4. 1, 4 - dichloro - 2- pentene

Solution

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Asked in: JEE Main 2002

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