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JAMB Chemistry 1980 Question 21

Question 21

Hydrocarbons

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called

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

Answer: B (addition)

Explanation

Chlorine adds across the C=C double bond of ethene, so it is an addition reaction (the product is really 1,2-dichloroethane).