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MHT CET202522 Apr 2025Evening ShiftChemistryGeneral Organic ChemistryActual

Which of the following alkenes does NOT exhibit cis-trans isomerism ?

Options

  1. ABut-1-ene
  2. BBut-2-ene
  3. C3,4-Dimethylhex-3-ene
  4. DPent-2-ene

Correct answer

A. But-1-ene

Step-by-step solution

Cis-trans isomerism requires that each carbon of the double bond be bonded to two distinct groups. But-1-ene, with structure CH ₂= CH - CH ₂- CH ₃ , has both hydrogens attached to the first carbon and thus fails this condition. But-2-ene, 3,4-dimethylhex-3-ene, and pent-2-ene all meet the requirement with different substituents on each olefinic carbon, so only but-1-ene lacks geometric isomers.

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