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Question 810004
JEE Chemistry · Medium

Isomerism: Geometrical isomerism conditions MCQ

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Geometrical isomerism conditionsMediumQuestion 810004

Question

Which compound shows cis-trans isomerism?
  1. A
    CH₃−CH=CH−CH₃ (but-2-ene)
    Correct
  2. B
    CH₂=CH₂ (ethene)
  3. C
    CH₂=CH−CH₃ (propene)
  4. D
    CH₃CH₂CH=CH₂ (but-1-ene)

Correct answer

CH₃−CH=CH−CH₃ (but-2-ene)

Explanation

For cis-trans isomerism, each doubly-bonded carbon must have two DIFFERENT substituents. In but-2-ene: C2 has H and CH₃; C3 has H and CH₃ — both meet the condition. Propene: C1 has two H → no isomerism. But-1-ene: C1 has two H → no isomerism.

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