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JAMB Chemistry 1984 Question 44

Question 44

Hydrocarbons

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bright sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone

  1. A.a polymerization reaction
  2. B.an isomerization reaction
  3. C.an addition reaction
  4. D.a substitution reaction
  5. E.a reduction reaction
Show the answer and explanation

Answer: D (a substitution reaction)

Explanation

A saturated hydrocarbon reacts with chlorine only in sunlight, and chlorine atoms replace hydrogen atoms one by one. That is a substitution reaction.