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JAMB Chemistry 1997 Question 43

Question 43

Hydrocarbons

The final product of the reaction of ethyne with hydrogen iodine is

  1. A.CH3 — CHI2
  2. B.CH2I–CH2I.
  3. C.CH3 — CI3
  4. D.CH2 = CHI.
Show the answer and explanation

Answer: A (CH3 — CHI2)

Explanation

Ethyne adds two molecules of HI. The first gives CH2=CHI; by Markovnikov's rule the second iodine goes on the carbon that already has one, giving CH3CHI2.