Polymerisation of Alkenes

Q.

Write structures of the products of the following reactions:

(i)

(ii)

(iii)

Q.

Explain hydrogenation with an example.

Q. Propyne on polymerisation gives

1. Ethyl benzene
2. Propyl benzene
3. Mesitylene
4. Benzene

Q. What is the effect of steric hindrance on sn1 reaction?

Q.

What is chain reaction polymerization?

Q.

Reaction mechanism given in ncert will be useful in neet?

Q. Which of the following is the monomer of polypropene?

1. $HC\equiv C-C{H}_3$
2. $H_{3}C-CH=C{H}_2$
3. None of the above
4. $H_{2}C=CH-CH=C{H}_2$

Q.

Polyisoprene is a:

1. Homopolymers

2. Natural rubber

3. Synthetic polymer

4. Addition polymer

Q.

The most probable structure for P in the following reaction is

1. 

2. 

3. 

4. 

Q. Give one example of a condensation polymer.

Q. When ethene is heated at ${400}^{\circ }C$ under high pressure, the product is/are

1. Carbon and $H_2$
2. Acetylene and $H_2$
3. Polyethylene
4. None of these

Q. For the given reaction , choose the correct option(s) :

1. A is propene
2. A is propyne
3. B is propylbenzene
4. B is 1, 3, 5-trimethylbenzene

Q. Which of the following sets contain only addition homopolymers?

1. Polythene, Natural rubber, Cellulose
2. Nylon, Polyester, Melamine resin
3. Neoprene, PVC, Polythene
4. Teflon, Bakelite, Orlon

Q. When ethene is heated at ${400}^{\circ }C$ under high pressure, the product is/are

1. Carbon and $H_2$
2. Polyethylene
3. Acetylene and $H_2$
4. None of these

Q. The monomer of Buna-S are:

1. styrene and butadiene
2. butadiene.
3. vinyl chloride and Sulphur
4. isoprene and butadiene

Q. Which of the following is copolymer?

1. Styrene butadiene rubber
2. Polythene
3. Nylon
4. None of the above

Q. In condensation of polymerization, involves monomers which contain functional groups of:

1. same kind
2. different kind
3. all groups
4. compounds

Q. Which of the following catalyst is used in the polymerisation of $CH\equiv CH$ to $C_6{H}_6$

1. $AlC{l}_3$
2. $HgS{O}_4$
3. $NbC{l}_3$
4. $HCl$

Q. The characteristics of condensation polymerization are given below:
I. only C-C linkages present in the polymer structure
II. use of bifunctional or polyfunctional monomers
III. elimination of a small byproduct molecule
Which of the following is true?

1. I, II, III
2. Only III
3. I and II
4. II and III

Q. Monomers are converted to polymer by:

1. Hydrolysis of monomers
2. Protonation of monomers
3. Condensation reaction between monomers
4. None of these

Q. Polypropylene can be obtained by polymerisation of:

1. $C{H}_3-CH=C{H}_2$
2. $C{H}_3-C\equiv CH$
3. $C{H}_2=C{H}_2$
4. $CH\equiv CH$

Q.

The most probable structure for P in the following reaction is

1. 

2. 

3. 

4. 

Q. Polythene is obtained by the polymerization of_________.

1. acetylene
2. a mixture of ethylene and styrene
3. styrene
4. ethene

Q. Propyne on polymerisation gives

1. Mesitylene
2. Benzene
3. Ethyl benzene
4. Propyl benzene

Q.

why does low density polythene hae a large of temp. and pressure while high density polythene have a short (really short) range of temp. and pressure?

Q. Name one polymer formed by step growth polymerisation. Give names of its monomers

Q. Polymerization of glycol with dicarboxylic acids is:

1. Addition polymerisation
2. Condensation polymerisation
3. Telomerisation
4. Any of these

Q.

Buna-S is

a) natural rubber b) sulphur rubber c) synthetic rubber d) none of these

Q. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:

1. $R_{3}SiCl$
2. $R_{3}SiC{l}_2$
3. $R_{4}Si$
4. $RSiC{l}_3$

Q. Differentiate between Homo-polymer and co-polymer