Which among the following pair of monomers does not generate polyamide polymer?

• A

  Adipic acid and Hexamethylene diamine
• B

  Urea and Formaldehyde
• C

  Glycine and $\epsilon$ amino caproic acid
• Correct answer
  D

  3-Hydroxybutanoic acid and 3-Hydroxy pentanoic acid

Solution

3-Hydroxybutanoic acid and 3-Hydroxy pentanoic acid It is ester, thus, option D is incorrect.

Hence, the correct answer is option: 'D'.