Chemistry Hydrocarbons MDCAT 2012
PMDC Verified Question 58 of 65
Ethene on polymerization, give the product polyethene, this reaction may be called as
A
Condensation
B
Substitution
C
Addition
D
Pyrolysis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Addition
Concept:

Polymerization reactions are broadly classified based on whether the monomer molecules simply add together or if a small byproduct molecule is eliminated.

Solution:

  • Ethene (\( \text{CH}_2=\text{CH}_2 \)) has a carbon-carbon double bond.


  • During polymerization, the pi bond breaks, and the ethene monomers link together in a continuous chain without the loss of any atoms.


  • Because nothing is lost and the monomers simply "add" to one another, this is strictly classified as an addition polymerization reaction.


Why other options are incorrect:

  • Condensation involves the loss of a small molecule (like water) when monomers join (e.g., nylon or polyester).


  • Substitution replaces an atom or group, which doesn't build a polymer chain here.


  • Pyrolysis is thermal decomposition (cracking) of large molecules into smaller ones.

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