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JAMB Chemistry 1983 Question 19

Question 19

Introduction to Organic Chemistry

C2H5—C(CH3)=CH2
The correct name of the compound with the above structural formula is

Diagram for this question
  1. A.2-methylbutane
  2. B.2-methylbut-2-ene
  3. C.2-methylbut-1-ene
  4. D.2-ethylprop-1-ene
  5. E.2-ethylprop-2-ene
Show the answer and explanation

Answer: C (2-methylbut-1-ene)

Explanation

The longest chain containing the double bond has four carbons with C=C starting at carbon 1, and a methyl group on carbon 2: 2-methylbut-1-ene.