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JAMB Chemistry 1995 Question 43

Question 43

Introduction to Organic Chemistry

CH3—CH(CH3)—CH=CH—CH3
The IUPAC nomenclature for the compound above is

  1. A.1, 1-dimethylbut-2-ene
  2. B.2-methylpent-3-ene
  3. C.4,4-dimethylbut-2-ene
  4. D.4-methylpent-2-ene
Show the answer and explanation

Answer: D (4-methylpent-2-ene)

Explanation

The longest chain has 5 carbons with a double bond. Numbering from the end nearest the double bond puts it at carbon 2 and the methyl group at carbon 4: 4-methylpent-2-ene.