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JAMB Chemistry 1993 Question 42

Question 42

Introduction to Organic Chemistry

CH3CH(CH3)CH2CH(CH3)CH2CH3
The IUPAC nomenclature for the compound above is

  1. A.dimethylhexane
  2. B.3,5 dimethylhexane
  3. C.1,1 dimethyl, 3 methylpentane
  4. D.2,4 dimethylhexane
Show the answer and explanation

Answer: D (2,4 dimethylhexane)

Explanation

The longest chain has 6 carbons (hexane). Numbering from the end nearest the branches puts the two methyl groups on carbons 2 and 4.