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JAMB Chemistry 1985 Question 35

Question 35

Introduction to Organic Chemistry

The I.U.P.A.C name for the compound CH3—CH(CH3)—CH = CH—CH3 is

  1. A.2-methyl-3-pentene
  2. B.4-methyl-2-pentene
  3. C.2-methyl-2-pentene
  4. D.4-methyl-3-pentene
  5. E.2-methyl-3-pentane
Show the answer and explanation

Answer: B (4-methyl-2-pentene)

Explanation

Number the five-carbon chain from the end nearer the double bond: the double bond starts at carbon 2 and the methyl group is on carbon 4, giving 4-methylpent-2-ene (4-methyl-2-pentene).