Chemistry 1 Marks Question

Polymers possessing amide linkages are important examples of synthetic fibres and are termed as nylons strong intermolecular forces like hydrogen bonding, lead to close packing of chains that imparts crystalline character.

Polymers which are formed by repeated addition of monomer molecules containing double and triple bonds are called addition polymers. Examples are polythene, PVC, PAN, PMMA, etc.

Rubber gets cross-linked through —S—S— bonds and becomes hard on vulcanisation.

The cis-polyisoprene molecule consists of various chains held together by weak van der Waals interactions and has a coiled structure. Thus, it can be stretched like a spring and exhibits elastic properties.

The monomers present in the polymer are melamine and formaldehyde.

Pure monomers are required because even the traces of impurities may act as initiators which lead to the formation of polymers of small chain lengths.

Enzymes are biocatalysts. They are basically proteins thus they are also considered as polymer.

Melamine and formaldehyde are starting materials for this intermediate. Its polymerisation gives melamine formaldehyde polymer.

Nylon-6,6.

The cis-polyisoprene molecule consists of various chains held together by weal vander Waals interactions and has a coiled structure. Thus, it can be stretched like a spring and shows elastic properties.

Novolac is a straight chain linear polymer but bakelite is cross linked.

Rubbers are stretched on application of force and come to its original position after the force is removed. Therefore, these are called elastomers.