Question

Polymer obtained by condensation polymerisation is
(A) Polythene
(B) Teflon
(C) PVC
(D) Bakelite

Answer 1

Polymers are high molecular masses containing molecules which form repeating structural units known as monomers. Monomers are low molecular masses containing molecules which form repeating structure units of polymer.

Complete step by step answer:
- The process of formation of polymers from their respective monomers is known as polymerisation. The polymer are two types on the basis of number of monomer from polymer-
$\left( 1 \right)$ Homo polymer- The polymer made by only one type of monomer is known as homo polymer. Example of homo polymer polystyrene is made of only one type of monomer that is styrene.
$\left( 2 \right)$Copolymer- The polymer made from more than one type of monomer is known as homo polymer. Example of copolymer is Buna S is made by buta 1, 3 dine.
- Polymer are two types on the basis of polymerisation-$\left( 1 \right)$ Addition polymerisation- Monomers add with each other repeatedly to form polymer and monomer having double and triple bonds.
$\left( 3 \right)$ Condensation polymerisation- Monomers of two or more kinds having different functional groups condense together to form polymer with the removal of small molecules like water, ammonia.
- Bakelite is an example of condensation polymer because when monomer phenol and formaldehyde react with each other to form Bakelite polymer and also produce water. So it is an example of condensation polymer. The correct answer is option “D” .

Additional Information :
- polymer are different type on the basis of source -
$\left( 1 \right)$ Natural polymer The polymer is obtained by plants and animals examples of homo polymer are starch, cellulose.
$\left( 2 \right)$semi-synthetic polymer – semi- synthetic polymer are obtained from nature but chemically modified in lab examples of semi-synthetic polymer are cellulose diacetate , vulcanised rubber.
$\left( 3 \right)$ Synthetic polymer: synthetic polymers are made by human beings in lab examples of synthetic polymer are polythene, nylon, Bakelite.

Note: Bakelite plays an important role in automotive and electrical products.
Soft Bakelite is used as glue to bind substances.
- Bakelite is a thermosetting polymer it means when Bakelite heated changed into hard infusible mass because of cross linking so can’t be used again.