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JAMB Chemistry 1992 Question 42

Question 42

Introduction to Organic Chemistry

CH3—C(CH2CH3) = CH—CH2—CH(CH3)—CH3
The IUPAC name for the hydrocarbon above is

Diagram for this question
  1. A.2 - ethyl - 5 - methylhex - 2 - ene
  2. B.2, 5 - dimethylhex - 2 - ene
  3. C.3, 5 - dimethylhept - 3 - ene
  4. D.3,6 - dimethylhept - 3 - ene.
Show the answer and explanation

Answer: D (3,6 - dimethylhept - 3 - ene.)

Explanation

The longest chain runs through the ethyl group and has 7 carbons. Numbering from the ethyl end puts the double bond at C3 and methyl groups at C3 and C6: 3,6-dimethylhept-3-ene.