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JAMB Chemistry 1989 Question 48

Question 48

Introduction to Organic Chemistry

What is the IUPAC name for the compound CH2 = C(CH3)CH2Cl?

  1. A.1-chloro-2-methylprop-2, 3-ene
  2. B.1-chloro-2-methylprop-2-ene
  3. C.3-chloro-2-methylprop-1-ene
  4. D.3-chloro-2-methylprop-1, 2-ene.
Show the answer and explanation

Answer: C (3-chloro-2-methylprop-1-ene)

Explanation

The double bond gets the lowest number, so it is between C1 and C2 (prop-1-ene). The methyl group is on C2 and the chlorine on C3.