Assertion : Teflon is chemically inert substance.

Reason : Chloroform when treated with antimony trifluoride gives teflon.

• 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.

Assertion: Natural rubber is a polymer of isoprene.

Reason: Isoprene is a pentene.

• 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.

Which of the following is a polyamide ?

• Bakelite

• Terylene

• Nylon - 66

• Teflon

Select the statement which is not true ?

• Nylon fibres are elastic .

• Nylon fibres are not crease resistant .

• Nylon fibres are used in parachute .

• Both (b) and (c) .

Natural rubber is a polymer of :

• cis-isoprene

• trans-isoprene

• co-cis and trans isoprene

• None of the above

436.

Which is correct example of condensation polymer?

• Nylon, Buna-S

• Teflon, Buna-N

• Nylon 6,6, Dacron

• Neoprene, Buna-S

Non-stick cookwares generally have a coating of a polymer, whose monomer is

• CH₂ = CH₂

• CH₂ = CHCN

• CH₂ = CHCl

• CF₂ = CF₂

The formula of nylon is :

• -[OC(CH2)₆-CONH-(CH2)4-NH]_n-

• -[OC(CH₂)₄-CONH-(CH₂)₆-NH]_n-

• -[OC(CH₂)₃-CONH-(CH₂)₆-NH]_n-

• [OC-(CH₂)₂-CONH-(CH₂)₆-NH]_n-

Isoprene is

• 3-methyl-1,2-butadiene

• 2-methyl-1,3-butadiene

• 3-chloro-1,2-butadiene

• 2-chloro-1,3-butadiene.

An ester linkage is present in :

• nylon - 6

• nylon - 6 , 6

• dacron

• rayon