Which of the following compounds represents the polymerization product of ethyne?

Which of the following compounds represents the polymerization product of ethyne?

The correct answer is A.

Explanation

Key chemistry idea

Ethyne undergoes cyclotrimerization (a form of polymerization) in which three molecules of ethyne combine to form benzene:

3C2H2 一>C6H6 ;(benzene)

Evaluate the options in the image

• A ✅
  This is benzene with three alternating double bonds → correct polymerization (trimerization) product of ethyne.

• B ❌
  Cyclohexene (only one double bond) → not from ethyne polymerization.

• C ❌
  Naphthalene (two fused benzene rings) → not formed directly from ethyne polymerization.

• D ❌
  Cyclohexadiene (not aromatic, not benzene).

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✅ Correct answer

A

This is the benzene ring, the polymerization (trimerization) product of ethyne.

PQN: 50