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JAMB Chemistry 1990 Question 50

Question 50

Hydrocarbons

Which of the following compounds represents the polymerization product of ethyne? (see the structures in the figure)

Diagram for this question
  1. A.Ring A: six-membered ring with three alternating double bonds
  2. B.Ring B: six-membered ring with two double bonds
  3. C.Ring C: two fused six-membered rings
  4. D.Ring D: six-membered ring with one double bond
Show the answer and explanation

Answer: A (Ring A: six-membered ring with three alternating double bonds)

Explanation

Three ethyne molecules join (passed over a hot catalyst) to form benzene, C6H6, the ring with three alternating double bonds.