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JAMB Chemistry 1994 Question 42

Question 42

Introduction to Organic Chemistry

CH3—C(CH3)2—CH=CH2
The IUPAC name of the compound above is

  1. A.2,2-dimethyl but-1-yne
  2. B.2,2-dimethyl but-1-ene
  3. C.3,3-dimethyl but-1-ene
  4. D.3,3-dimethyl but-1-yne
Show the answer and explanation

Answer: C (3,3-dimethyl but-1-ene)

Explanation

The chain has 4 carbons with a C=C double bond, numbered from the double-bond end so it starts at carbon 1 (but-1-ene). Both methyl groups are then on carbon 3.