(a) Differentiate Thermoplastic and Thermosetting polymer with examples. (b) Calculate the number-average molecular mass, weight-average molecular mass and polydispersity index for a polymer sample containing 50 molecules of molecular weight 5000 and 75 molecules of molecular weight 6000. (c) Write down the formation and structure of the Nylon 66 polymers and also indicate their monomer unit.

4. (a) Differentiate Thermoplastic and Thermosetting polymer with examples. (b) Calculate the number-average molecular mass, weight-average molecular mass and polydispersity index for a polymer sample containing 50 molecules of molecular weight 5000 and 75 molecules of molecular weight 6000. (e) Write down the formation and structure of the Nylon 66 polymers and also indicate their monomer unit