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JAMB Chemistry 1979 Question 8

Question 8

Introduction to Organic Chemistry

The IUPAC name for CH3–CH(CH3)–CH = CH2 is

  1. A.2-methylbut-3-ene
  2. B.2-methylbut-4-ene
  3. C.3-methylbut-2-ene
  4. D.3-methylbut-1-ene
  5. E.3-methylpent-1-ene.
Show the answer and explanation

Answer: D (3-methylbut-1-ene)

Explanation

The longest chain has 4 carbons with the double bond; numbering from the double-bond end puts it at C1 and the methyl group on C3: 3-methylbut-1-ene.