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

Styrene can be purified by

• simple distillation

• fractional distillation

• steam distillation

• vacuum distillation

157.

The monomer of teflon is

• CHF = CH₂

• CF₂ = CF₂

• CHCl = CHCl

• CHF = CHCl

The monomer of the polymer

• H₂C = C(CH₃)₂

• (CH₃)₂C = C(CH₃)₂

• CH₃CH = CH CH₃

• CH₃CH = CH₂

When addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of ziegler-Natta catalyst, it forms:

• LDP

• HDP

• Polyacrylnitrile

• Teflon

Which of the following polymers is prepared by condensation polymerisation ?

• Teflon

• Styrene

• Rubber

• Nylon 6, 6