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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl247

The two compounds shown react to give a polymer. Select all correct statements.

  1. AThe product is an aromatic polyamide (aramid)
  2. BTwo molecules of HCl are eliminated per repeat unit
  3. CThe product is a chain-growth addition polymer
  4. DStrong hydrogen bonding between rigid chains gives a high-strength fibre

Answer: A, B, D

Benzene-1,4-diamine and benzene-1,4-dicarbonyl dichloride give an aromatic polyamide (an aramid, Kevlar) by step-growth condensation. Two N-H/C-Cl exchanges occur per repeat unit, so two HCl are lost. Rigid rings and strong hydrogen bonding between chains give very high tensile strength, while statement C is wrong because neither monomer contains a C=C for chain-growth addition.
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