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ChemistryNEET 2025Isomerism: structural and stereo

Organic Chemistry: Some Basic Principles and Techniques

Which one of the following compounds can exist as cis–trans isomers?

  1. A.Pent-1-ene
  2. B.2-Methylhex-2-ene
  3. C.1,1-Dimethylcyclopropane
  4. D.1,2-Dimethylcyclohexane✓

Solution

Cis–trans isomerism needs two different groups on each of two ring carbons (or double-bond carbons). 1,2-Dimethylcyclohexane can place the two methyls on the same or opposite faces of the ring. Pent-1-ene and 2-methylhex-2-ene have identical groups on one double-bond carbon; 1,1-dimethylcyclopropane has both methyls on one carbon.

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