161.

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

Three dimensional molecules with cross links are formed in the case of a :

• thermoplastic

• thermosetting plastic

• Both (a) and (b)

• None of these

Among the following substituted silanes, the one which will give rise to cross-linked silicone polymer on hydrolysis is

• R₃SiCl

• R₄Si

• RSiCl₃

• R₂SiCl₂

Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation.

I. CH₂ = CH - C₆H₄(NO₂)
II. CH₂ = CH - C₆H₄(CH₃)
III. CH₂ = CH - C₆H₄(OCH₃)

• I > II > III

• II > I > III

• III > II > I

• I > III > II

Which is not classified as thermoplastics?

• Polyethylene

• Polystyrene

• Bakelite

• Neoprene

Which ofthe following is true regarding teflon ?

• It is a linear, unbranched polymer of tetrafluoro ethylene

• It has very high thermal stability

• Polymer molecules are associated by strong dipole-dipole attraction

• All of the above