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JAMB Chemistry 1980 Question 34

Question 34

Introduction to Organic Chemistry

The IUPAC name for the compound CH3–CH2–C(CH3) = C(CH3)–CH3 is

  1. A.2, 3-dimethylpent-2, 3-ene
  2. B.2, 3-dimethylpent-2-ene
  3. C.3, 4-dimethylpent-3-ene
  4. D.3, 4-dimethylpentene
  5. E.3, 4-dimethylhept-2-ene.
Show the answer and explanation

Answer: B (2, 3-dimethylpent-2-ene)

Explanation

The main chain has 5 carbons. Numbering from the right gives the double bond the lowest number (C2) and methyl groups on C2 and C3: 2,3-dimethylpent-2-ene.