Question

Which of the following polymers is prepared by condensation polymerization: Nylon-6,6 or Polythene?

• A. Polythene
• B. Nylon-6,6
• C. Both
• D. None of these

Hint:

If polymer formation releases small molecules like \(H_2O\) or \(HCl\), the reaction is condensation polymerization.

Answer 1

The Correct Option is B

Concept: Polymers are classified based on their method of formation:

• Addition polymerization: Monomers join together without elimination of any small molecule.
• Condensation polymerization: Monomers combine with elimination of small molecules such as \(H_2O\), \(HCl\), or \(NH_3\).

Step 1: {Consider Polythene.} Polythene is formed by addition polymerization of ethene. \[ n(CH_2 = CH_2) \rightarrow (-CH_2-CH_2-)_n \] No small molecule is eliminated during this reaction. Hence, it is an addition polymer.
Step 2: {Consider Nylon-6,6.} Nylon-6,6 is formed from hexamethylenediamine and adipic acid. \[ nH_2N-(CH_2)_6-NH_2 + nHOOC-(CH_2)_4-COOH \] During polymer formation, water molecules are eliminated. \[ \rightarrow (-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-)_n + H_2O \] Thus, Nylon-6,6 is formed by condensation polymerization.
Step 3: {Conclusion.} Therefore, the polymer prepared by condensation polymerization is: \[ Nylon-6,6 \]