$-\left[\mathrm{NH}{\left({\mathrm{CH}}_2\right)}_6\mathrm{NHCO}{\left({\mathrm{CH}}_2\right)}_4\mathrm{CO}\right]{-}_n$ is a -

1. Copolymer.

2. Addition polymer.

3. Thermo-setting polymer.

4. Homopolymer.

Nylon-6,6 is a polyamide obtained by the reaction of

1. $\mathrm{COOH}({\mathrm{CH}}_2{)}_4\mathrm{COOH}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{H}}_2{\mathrm{NC}}_6{\mathrm{H}}_4{\mathrm{NH}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>(p)$

2. $\mathrm{COOH}({\mathrm{CH}}_2{)}_4\mathrm{COOH}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{NH}}_2({\mathrm{CH}}_2{)}_6{\mathrm{NH}}_2<mspace\; width="1em"></mspace>$

3. $\mathrm{COOH}({\mathrm{CH}}_2{)}_4\mathrm{COOH}<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{NH}}_2({\mathrm{CH}}_2{)}_4{\mathrm{NH}}_2<mspace\; width="1em"></mspace>$

4. ${\mathrm{COOHC}}_6{\mathrm{H}}_4\mathrm{COOH}<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\left(p\right)<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{NH}}_2({\mathrm{CH}}_2{)}_6{\mathrm{NH}}_2$

Which one is protein fibre ?

1. Cotton

2. Rayon

3. Silk

4. Polyster

Terylene is a condensation polymer of ethylene glycol and

1. Benzoic acid

2. Phthalic acid

3. Salicylic acid

4. Terephthalic acid

The polymer that can be classified as polyster polymer is : 

1. Bakelite

2. Melamine

3. Nylon-66

4. Terylene