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JAMB Chemistry 2005 Question 11

Question 11

Introduction to Organic Chemistry

CH3 − CH(CH3) − CH = CH2
The IUPAC nomenclature for the hydrocarbon above is

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

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

Explanation

The longest chain has 4 carbons (butene). Numbering from the end nearest the double bond puts it at C1 and the methyl group on C3: 3-methylbut-1-ene.