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JAMB Chemistry 2005 Question 17

Question 17

Hydrocarbons

Equal moles of ethyne and hydrogen iodide react to give

  1. A.CH2 = CH2
  2. B.CH2 − CHI
  3. C.CH3 − CI3
  4. D.CH2 = CHI
Show the answer and explanation

Answer: D (CH2 = CHI)

Explanation

One mole of HI adds across one of the two π bonds of the triple bond: HC≡CH + HI → CH2=CHI (iodoethene).