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

426.

Assertion : 2-Methyl-1, 3-butadiene is the monomer of natural rubber.

Reason : Natural rubber is formed through anionic addition polymerisation. 

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

The example of condensation polymerisation is :

• formaldehyde - metaformaldehyde

• acetaldenyde - para acetaldehyde

• acetone - mesityl oxide

• ethene - polyethene

Monomers of nylon 2-nylon 6 are

• glycine and amino caproic acid

• glycine and caproic acid

• hexamethylene diamine and adipic acid

• alanine and amino caproic acid.

The polymer obtained by the interaction of ethylene glycol and terephthalic acid is

• nylon

• dacron

• teflon

• bakelite

Assertion : Orlon is used as a synthetic fibre.

Reason : The monomer of orion is vinyl chloride

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.