Multiple Choice QuestionsSelect 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
Which is correct example of condensation polymer?
Nylon, Buna-S
Teflon, Buna-N
Nylon 6,6, Dacron
Neoprene, Buna-S
C.
Nylon 6,6, Dacron
Nylon 6, 6 and dacron are the examples of condensation polymers. Condensation polymers are formed by condensation of two or more bifunctional monomers with the elimination of simple molecules like H2O, NH3, alcohol, etc. Dacron is formed from ethylene glycol and terephthalic acid with the removal of H-O. Nylon 6, 6 is formed from hexamethylenediamine and adipic acid with the removal of HO.
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.
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