passwella.
Menu

JAMB Chemistry 1984 Question 42

Question 42

Introduction to Organic Chemistry

Which of the following structural formulae is NOT isomeric with the others?

Diagram for this question
  1. A.CH3CH2CH2CH2OH
  2. B.CH3–O–CH2CH2CH3
  3. C.CH3CH(OH)CH2CH3
  4. D.CH3–CH–CH–CH3 with an O bridging the two middle carbons
  5. E.CH3CH2–O–CH2CH3
Show the answer and explanation

Answer: D (CH3–CH–CH–CH3 with an O bridging the two middle carbons)

Explanation

A, B, C and E all have the formula C4H10O. D has the oxygen in a ring between two carbons, so it has only 8 hydrogens (C4H8O) and is not an isomer of the others.