Polymer formation from monomers starts by

• condensation reaction between monomers

• coordination reaction between monomers

• Conversion of one monomer into other monomers

• hydrolysis of monomers

Which of the following fibres is made of polyamides?

• Dacron

• Orion

• Nylon

• Rayon

Consider the following reaction,

$$\begin{gathered} \mathrm{X} \stackrel{\mathrm{Bromination}}{\to } \mathrm{Y} \underset{+ \mathrm{HCl}}{\overset{{\mathrm{NaNO}}_2}{\to }} \mathrm{Z} \\ \mathrm{Z} \underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{\mathrm{Boiling}}{\to }} \mathrm{Tribromo} -\mathrm{benzene} \mathrm{X} \mathrm{is} \end{gathered}$$

• benzoic acid

• salicylic acid

• Phenol

• Aniline

404.

Which of the following statements is incorrect?

• Polypropylene is a thermoplastic polymer

• Melamine-formaldehyde is a thermosetting polymer

• Mixture of styrene and methyl methacrylate can form ionic addition polymer

• Low-density polythene is a poor conductor of electricity

Polypropylene can be obtained by polymerisation of

• CH₂ $=$ CH - CH₂ - Cl

• CH₂ $=$ CH - Cl

• CH₃ - Cl

• CH₃ - CHCl₂

Buna-N, a synthetic rubber is copolymer of

• H₂C = CH - CH = CH₂ and H₅C₆ - CH = CH₂

• H₂C = CH - CN and H₂C = CH - CH = CH₂

• H₂C = CH - CCl = CH₂ and H₂C = CH - CH = CH₂

• H₂C = CN - CN and H₂C = CH - CCl = CH₂

An example of natural biopolymer is

• teflon

• nylon-66

• rubber

• DNA

The condensation polymer among the following is

• rubber

• protein

• PVC

• polyethene

The monomers of terylene are

• phenol and formaldehyde

• ethylene glycol and phthalic acid

• adipic acid and hexamethylenediamine

• ethylene glycol and terephthalic acid

Heating of rubber with sulphur is called

• vulcanisation

• galvanisation

• sulphonation

• bessemerisation