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JAMB Chemistry 1989 Question 41

Question 41

Introduction to Organic Chemistry

Which of the following compounds is an isomer of the compound CH3–CH2–CH(CH3)–CH2–CH3?

  1. A.CH3–CH2–CH(CH2CH3)–CH2–CH3
  2. B.CH3–CH2–CH(CH2CH3)–CH3
  3. C.CH3–CH2–CH(CH3)–CH3
  4. D.CH3–CH(CH3)–CH2–CH2–CH3
Show the answer and explanation

Answer: D (CH3–CH(CH3)–CH2–CH2–CH3)

Explanation

The compound is 3-methylpentane, C6H14. Option D (2-methylpentane) has the same formula but a different structure. A has 7 carbons, C has 5, and B is the same compound drawn differently.