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JAMB Chemistry 1991 Question 40

Question 40

Introduction to Organic Chemistry

Which of the following compounds can exist as geometric isomers?

  1. A.2-methylbut-2-ene.
  2. B.But-2-ene
  3. C.But-1-ene
  4. D.CI—C—Br with I above and I below the carbon
Show the answer and explanation

Answer: B (But-2-ene)

Explanation

Geometric (cis–trans) isomers need two different groups on each carbon of the C=C. But-2-ene has CH3 and H on each carbon; the others have two identical groups on one carbon or no C=C.