Styrene can be purified by

• simple distillation

• fractional distillation

• steam distillation

• vacuum distillation

412.

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

Which is used as medicine?

• PVC

• Terylene

• Glyptal

• Urotropine

Substance having ester linkage is

• bakelite

• polythene

• PVC

• terylene

Which of the following, is a mordant dye?

• Aniline black

• Congo-red

• Alizarin

• Indigo

Buna-N synthetic rubber is a copolymer of:

• H₂C=CH-CN and H₂C=CH-CH=CH₂

• H₂C=CH-CN and H₂C=CH-$\underset{\underset{\mathrm{Cl}}{|}}{\mathrm{C}}$=CH₂

• H₂C=CH-$\underset{\underset{\mathrm{Cl}}{|}}{\mathrm{C}}$=CH and H₂C=CH-CH=CH₂

• H₂C=CH-CH=CH₂ and H₅C₆-CH=CH₂

Which one of the following molecules undergoes polymerisation to form natural rubber?

• Styrene

• 2-methyl-1, 3-butadiene

• Ethylene

• Iso-butene