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JAMB Chemistry 1997 Question 41

Question 41

Introduction to Organic Chemistry

The IUPAC nomenclature of the organic compound with the above structural formula is
CH3—CH(CH3)—CH(CH2CH3)—CH2—CH(CH3)—CH3

Diagram for this question
  1. A.3-ethyl-2, 5 - dimethylhexane
  2. B.4 - ethyl - 2, 5 - dimethylhexane
  3. C.3 - ethyl, 1, 1, 4 - trimethylpentane
  4. D.3 - ethyl - 2, 5, 5 - trimethylpentane.
Show the answer and explanation

Answer: A (3-ethyl-2, 5 - dimethylhexane)

Explanation

The longest chain has six carbons (hexane). Numbering from the end that gives the lowest locants puts methyl groups on C2 and C5 and an ethyl group on C3: 3-ethyl-2,5-dimethylhexane.