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JAMB Chemistry 1981 Question 45

Question 45

Introduction to Organic Chemistry

The IUPAC name for (CH3)2CH—CH2—CH3 is

Diagram for this question
  1. A.1-methylpentane
  2. B.3-methylbutane
  3. C.2-methylbutane
  4. D.1-dimethylpropane
  5. E.2-methylpentane
Show the answer and explanation

Answer: C (2-methylbutane)

Explanation

The longest chain has four carbons (butane) and the CH3 branch sits on carbon 2 when numbered from the nearer end, so it is 2-methylbutane.