Copolymer

Q.

What is the difference between monomers and polymers?

Q. Considering the reaction sequence given below, the correct statement(s) is(are)

\( H _{3} COOH \frac{1 . Br _{2} \text {, red phospohorus }}{2 . H _{2} O } \longrightarrow P \) 1. 2. \( NnOH _{3 .} H _{3} \)

1. $P$ can be reduced to a primary alcohol using ${\text{NaBH}}_4$.
2. Treating $Q$ with a solution of ${\text{NaNO}}_2$ in aq. $\text{HCl}$ liberates ${\text{N}}_2$.
3. $P$ is more acidic than ${\text{CH}}_3{\text{CH}}_2\text{COOH}$.
4. Treating $P$ with conc. ${\text{NH}}_4\text{OH}$ solution followed by acidification gives $Q$.

Q.

What happens when phenol is condensed with HCHO(formaldehyde) in presence of NaoH.

And please answer my previous organic chemistry question, it is opened for more than a week

Q.

Dacron is an example of

1. Poly amide

2. Poly urethane

3. Poly propylene

4. Poly ester

Q.

Preparation of Bakelite proceeds via reactions:

1. Electrophilic substitution and dehydration.

2. Electrophilic addition and dehydration.

3. Condensation and elimination

4. Nucleophilic addition and dehydration

Q.

Which of the following sets contain only copolymers?

1. Polythene, Polyester, PVC

2. Melmac, Bakelite, Teflon

3. SBR, Glyptal, Nylon - 6, 6

4. Nylon - 6, Butyl rubber, Neoprene

Q.

The correct match between Item- 1 and Item-2 is:

1. (a) - (III), (b) - (IV), (c) - (I), (d) - (II)

2. (a) - (IV), (b) - (III), (c) - (II), (d) - (I)

3. (a) -(IV), (b) - (III), (c) - (I), (d) - (II)

4. (a) - (III), (b) - (IV), (c) - (II), (d) - (I)

Q.

Which of the following is an example of condensation homopolymer?

1. Bakelite

2. Malmac

3. Perlon

4. Alkyl resin

Q.

Which of the following polymers, need atleast one diene monomer for their preparation?

(a) Dacron

(b) Buna-S

(c) Neoprene

(d) Novolac

Q.

Saran is

1. An addition homo polymer

2. A Copolymer of vinyl chloride and vinylidene chloride

3. A condensation homo polymer

4. A condensation co-polymer

Q. Monomer on heating with formaldehyde forms infusible solid mass called .

1. bakelite
2. melamine
3. adipic acid
4. nevolac

Q.

What is the meaning of polymer and monomer?

Q.

Isoprene is used for making:

1. Bakelite

2. Liquid fuels

3. Polythene

4. Rubber

Q.

Bakelite ${({\mathrm{C}}_6{\mathrm{H}}_6\mathrm{O}-{\mathrm{CH}}_2\mathrm{OH})}_{\mathrm{n}}$ is obtained from phenol by reacting with

1. ${\left({\mathrm{CH}}_2\mathrm{OH}\right)}_2$

2. ${\mathrm{CH}}_3\mathrm{CHO}$

3. ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

4. $\mathrm{HCHO}$

Q.

Identify the type of polymer

$-A-B-B-A-A-A-B-A-$

Q. Is $-(C{H}_2-\underset{Cl}{\underset{|}{C{H}_n}})-$ a homopolymer or a copolymer?

Q.

Which of the following is not correct regarding Terylene

1. Synthetic fibre

2. It is also called dacron

3. Step growth polymer

4. Condensation polymer

Q.

Explain the term copolymerization and give two examples.

Q. Synthetic human hair wigs are made from a copolymer of vinyl chloride and acrylonitrile and is called:

1. Polyacrylonitrile
2. Cellulose
3. Dynel
4. PVC

Q. Give an example of each of homopolymer and copolymer.

Q. Bakelite is obtained from phenol by reacting with:

1. (CH₂OH)₂
2. CH₃CHO
3. CH₃COCH₃
4. HCHO

Q. To solve the problem of looking bald, human hair wigs are worn which are very expensive. Synthetic wigs are made from a copolymer of vinyl chloride and acrylonitrile called:

1. dynel
2. cellulose
3. polyacrylonitrile
4. PVC (or polyvinyl chloride)

Q. $1,3$ - butadiene and acrylonitrile undergo co-polymerization to give ___

1. Buna - S
2. Buna - N
3. Buna - A
4. All

Q. What is phase why pvc coating done in wire

Q. What is a copolymer?

1. A polymer formed from condensation polymerization
2. A polymer made of 2 or more monomeric units
3. A polymer with exactly 3 monomeric units.
4. A condensation polymer of similar monomeric units

Q. Which of the following is NOT the application of the product formed by the condensation of phenols with formaldehyde?

1. Adhesives
2. Electrical insulations
3. PVC pipes
4. In automobile industry

Q. Buna-S is a copolymer of:

1. styrene and ethylene
2. styrene and $1,3$ - butadiene
3. $1,3$ - butadiene and ethylene
4. $1,3$ - butadiene and acrylonitrile

Q.

Which is a naturally occuring polymer [BHU 1980]

1. Protein

2. Polythene
3. PVC
4. Acetic acid

Q.

Is , a homopolymer or copolymer?

Q. Vinylite resins are copolymers of vinyl acetate and vinyl chloride. They are resistant to wear and tear to chemicals. One of their well-known uses is in:

1. floor coverings
2. ropes
3. tyres
4. electrical insulators