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JAMB Chemistry 2008 Question 41

Question 41

Introduction to Organic Chemistry

The IUPAC nomenclature for the structure above is

Diagram for this question
  1. A.2, 3 − dichloro − 4, 4, 5 − trimethyl pent - 2- ene
  2. B.4, 5 − dichloro − 2, 3 − dimethyl hex − 2 − ene
  3. C.2, 3 − dichloro − 4, 4 − dimethyl hex − 2 − ene
  4. D.2, 3 dichloro − 2, 2 − dimethyl hex − 2 − ene
Show the answer and explanation

Answer: C (2, 3 − dichloro − 4, 4 − dimethyl hex − 2 − ene)

Explanation

The structure is CH3CH2C(CH3)2C(Cl)=C(Cl)CH3. The longest chain has 6 carbons; numbering from the right puts the double bond at C2, both Cl on C2 and C3 and two methyls on C4.