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Preparation of Bakelite proceeds via reactions:
Option: 1 Electrophilic addition and dehydration

Option: 2 Condensation and elimination

Option: 3 Nucleophilic addition and dehydration

Option: 4 Electrophilic substitution and dehydration
 

Preparation of Bakelit follows Electrophilic substitution and dehydration reaction:

\mathrm{\overset{Dehydration}{\rightarrow}}

Therefore, Option(4) is correct

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Posted by

vishal kumar

The correct match between Item - I and Item - II is :
  Item - I      Item - II
(a) Natural Rubber (I) 1, 3-butadiene + styrene
(b) Neoprene (II) 1,3-butadiene +acrylonitrile
(c) Buna - N (III) Chloroprene
(d) Buna-S (IV) Isoprene

Option: 1 (a) - (III), (b) - (IV), (c) - (I), (d) - (II)
Option: 2 (a) - (III), (b) - (IV), (c) - (II), (d) - (I)
Option: 3 (a) - (IV), (b) - (III), (c) - (II), (d) - (I)
Option: 4 (a) - (IV), (b) - (III), (c) - (I), (d) - (II)

 

We know these polymers -

 

Correct match : (a) - (IV), (b) - (III), (c) - (II), (d) - (I)

Therefore, the correct option is (3).

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Posted by

Kuldeep Maurya

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Which of the following polymer is used in the manufacture of wood laminates?
Option: 1 cis-poly isoprene
Option: 2 Phenol and formaldehyde resin
Option: 3 Melamine and formaldehyde
Option: 4 Urea and formaldehyde resin

Urea-formaldehyde resin is used in the manufacture of wood laminates.

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Posted by

Kuldeep Maurya

Which among the following is not a polyester?
Option: 1 Glyptal
Option: 2 PHBV
Option: 3 Novolac
Option: 4 Dacron

As we have learnt,

Novalac is a condensation polymer of phenol and formaldehyde. It is not a polyester.

The other polymers are polyesters and their monomers are given below:

Glyptal : Phthalic acid and Ethylene Glycol

PHBV : \beta-hydroxy-Butanoic acid and  \beta-hydroxy-Pentanoic acid.

Dacron: Terephthalic acid and Ethylene Glycol

Hence the correct answer is option (3)

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Posted by

sudhir.kumar

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Monomer of Novolac is :
Option: 1 3-Hydroxybutanoic acid
Option: 2 1,3-Butadiene and styrene
Option: 3 phenol and melamine
Option: 4 o-Hydroxymethylphenol

Novolac is obtained by polymerisation of Phenol and formaldehyde.

o- Hydroxymethylphenol is obtained due to electrophilic substitution of formaldehyde on Phenol .


Hence, the correct answer is option (4)

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Posted by

sudhir.kumar

Monomer units of Dacron polymer are :
Option: 1 Glycerol and phthalic acid
Option: 2 Ethylene glycol and phthalic acid
Option: 3 Ethylene glycol and terephthalic acid
Option: 4 Glycerol and terephthalic acid

As we have learnt, 

Dacron, also called as Terylene, is a polyester formed by the polymerisation of Terephthalic  acid and ethylene glycol.


Hence, the correct answer is Option (3)

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Posted by

sudhir.kumar

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Match List-I with List-II :
List-I   List-II
(a) Chloroprene     
(b) Neoprene         
(c) Acrylonitrile      
(d) Isoprene   
  Choose the correct answer from the options given below:
Option: 1 (a) - (iii), (b)-(iv), (c) -(ii), (d) -(i)
Option: 2 (a) - (ii), (b)-(iii), (c) -(iv), (d) -(i)
Option: 3 (a) - (ii), (b)-(i), (c) -(iv), (d) -(iii)
Option: 4 (a) - (iii), (b)-(i), (c) -(iv), (d) -(ii)

The correct match is given below

 

Hence, the correct answer is option (2)

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Posted by

sudhir.kumar

Bakelite is a cross-linked polymer of formaldehyde and:
Option: 1 PHBV
Option: 2 Buna-S
Option: 3 Novolac
Option: 4 Dacron

As we have learnt,

Phenol and fomaldehyde undergo polymerisation to form Novolac which is a linear polymer.

Novolac further undergoes choss linking with formaldehyde to obtain Bakelite resin.

 

Hence, the correct answer is option (3).

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Posted by

sudhir.kumar

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Orlon fibres are made up of :
Option: 1 Polyacrylonitrile
Option: 2 Polyesters
Option: 3 Polyamide
Option: 4 Cellulose

Fact Based.

Orlon fibers are made up of polyacrylonitrile.

Hence, the correct answer is option (1).

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Posted by

sudhir.kumar

A biodegradable polyamide can be made from:
Option: 1 Glycine and isoprene
Option: 2 Hexamethylene diamine and adipic acid
Option: 3 Glycine and aminocaproic acid
Option: 4 Styrene and caproic acid

As we have learnt,

Nylon 2 -Nylon 6 is a biodegradable polymer. It Is a polyamide made from the condensation of Glycine and Aminocapraoic Acid.

Hence, the correct answer is option (3)

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Posted by

sudhir.kumar

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