Chapter 15: Polymers

Ans:  (i) Glyptal is formed by the condensation polymerization of polyester of glycol and phthalic acid.

Thus, option (i) from column I is matched with (b) from column II.

(ii) Buna-S is formed from the polymerization of styrene and 1,3-butadiene.

Thus, option (ii) from column I is matched with (c) from column II.

(iii) Novolac is formed as an intermediate in the formation of Bakelite. Bakelite is formed from formaldehyde and phenol.

Thus, option (iii) from column I is matched with (a) from column II.

(iv) Dacron is obtained from the polymerization of polyester of glycol and terephthalic acid.

Thus, option (iv) from column I is matched with (e) from column II.

(v) Buna-N is formed from the polymerization of 1,3-butadiene and acrylonitrile.

Thus, option (v) from column I is matched with (d) from column II.

Ans:  (i) Bakelite is used in making combs, electrical switches.

Thus, option (i) from column I is matched with (d) from column II.

(ii) LDP is used in the manufacture of squeezes bottles, toys etc.

Thus, option (ii) from column I is matched with (e) from column II.

(iii) Melamine formaldehyde resin is used in the manufacture of unbreakable crockery.

Thus, option (iii) from column I is matched with (a) from column II.

(iv) Nylon-6 is used in the manufacture of tyre, cords.

Thus, option (iv) from column I is matched with (f) from column II.

(v) Poly tetrafluoro ethane is used in the manufacture of non stick cookware items like pan, cooker.

Thus, option (v) from column I is matched with (b) from column II.

(vi) Polystyrene is used in the manufacture of packaging material.

Thus, option (vi) from column I is matched with (c) from column II.

Ans: 

(i) Nylon-6,6 is obtained by the condensation polymerization of hexamethylenediamine with adipic acid at high pressure and temperature.

Thus, option (i) from column I is matched with (d) from column II.

(ii) Poly vinyl chloride is obtained by the free radical polymerisation.

Thus, option (ii) from column I is matched with (a) from column II.

(iii) When addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and Ziegler-Natta catalyst at high temperature and pressure then high density polythene is formed.

Thus, option (iii) from column I is matched with (b) from column II.

Ans: 

(i) Terylene or Dacron have ester linkage.

Thus, option (i) from column I is matched with (b) from column II.

(ii) Nylon have amide linkage present in them.

Thus, option (ii) from column I is matched with (d) from column II.

(iii) Cellulose is stored by plants. It contains glycosidic linkage.

Thus, option (iii) from column I is matched with (a) from column II.

(iv) Proteins contains amide linkage.

Thus, option (iv) from column I is matched with (d) from column II.

(v) RNA contains phosphate, sugar and base. They contains phosphodiester linkage.

Thus, option (v) from column I is matched with (c) from column II.

Ans: 

(i) Natural rubber is a linear polymer of isoprene units. It is also known as cis-polyisoprene.

Thus, option (i) from column I is matched with (f) from column II.

(ii) Urea formaldehyde resin is used in the manufature of wood laminates.

Thus, option (ii) from column I is matched with (e) from column II.

(iii) Nylon is used in making ropes and fibres.

Thus, option (iii) from column I is matched with (a) from column II.

(iv) Dacron is obtained from the polymerization of polyester of glycol and terphthalic acid.

Thus, option (iv) from column I is matched with (c) from column II.

(v) Neoprene is a type of synthetic rubber. It is formed by the free radical polymerisation of chloroprene.

Thus, option (v) from column I is matched with (b) from column II.

(vi) Melamine formaldehyde resin is used in the manufacture of unbreakable crockery.

Thus, option (vi) from column I is matched with (d) from column II.

Ans: (i) Acrilan is formed by the addition polymerization of acrylonitrile in the presence of peroxide catalyst.

Thus, option (i) from column I is matched with (d) from column II.

(ii) Polystyrene is formed by the polymerization of styrene monomer.

Thus, option (ii) from column I is matched with (a) from column II.

(iii) Neoprene is a type of synthetic rubber. It is formed by the free radical polymerisation of chloroprene.

Thus, option (iii) from column I is matched with (b) from column II.

(iv) Novolac is formed as an intermediate in the formation of Bakelite. Bakelite is formed from formaldehyde and phenol.

Thus, option (iv) from column I is matched with (e) from column II.

(v) Buna-N is formed from the polymerization of 1,3-butadiene and acrylonitrile.

Thus, option (v) from column I is matched with (c) from column II.

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

(i) Assertion and reason both are correct statement but reason does not explain assertion.

(ii) Assertion and reason both are correct statements and reason explains the assertion. 

(iii) Both assertion and reason are wrong statement.

(iv) Assertion is correct statement and reason is wrong statement. 

(v) Assertion is wrong statement and reason is correct statement.

Ans:  (ii) Assertion and reason both are correct statements and reason explains the assertion.

Explanation:  Rayon is a semi synthetic polymer. It is preferred over cotton fabric because its properties are improved by acetylation.

Ans: (iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.

Explanation:  Most of the Synthetic polymers are not biodegradable. A large number of the polymers are resistant to the degradation process of the environment and therefore, are responsible for the accumlation of polymeric solid waste material.

Ans: (i) Assertion and reason both are correct statement but reason does not explain assertion.

Explanation: Olefinic monomers undergo addition polymerisation. The molecules of the same monomer or different monomer are added together to form this type of polymer. This mode of polymerisation leads to an increase in chain length.

Ans: (ii) Assertion and reason both are correct statements and reason explains the assertion.

Explanation: Polyamides are best used as fibres because of high tensile strength. They have strongest intermolecular forces of attraction like hydrogen bonding. It lead to close packing of chains and increase the crystalline character.