cis-Polyisoprene possesses elastic property because:

it is soft and soluble in non-polar solvent

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it is unsaturated and porous

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it has a coiled structure and chains held together by weak van der Waals forces

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it has a fibrous structure and reactive sites at various double bonds

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Solution

The correct option is C it has a coiled structure and chains held together by weak van der Waals forces
Properties of elastomers-
These are rubber-like solids with elastic properties,
The polymer chains are held together by the weakest intermolecular forces that permit the polymer to be stretched,
A few ‘crosslinks’ are introduced in between the chains, which help the polymer to retract to its original position
Example= Cis-polyisoprene, the correct option is [C].

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In fibrous proteins, polypeptide chains are held together by ........... .
(a) van der Waals forces (b) disulphide linkage
(c) electrostatic forces of attraction (d) hydrogen bonds

Q. Regarding secondary structure of a protein, correct statement(s) is/are
A) Peptide bonds possess regional planarity.
B)

C = O

and

- N H

of different peptide chains are held by Van der Waal's attractions.
C) They have closely packed arrangement so as to minimise repulsion between R groups.

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I : In diamond, each carbon atom is linked tetrahedrally for four other carbon atoms by

{s p}^{3}

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II : Graphite has planar hexagonal layers of carbon atoms held together by weak Van der Waal's forces.
III : Silicon exists only in diamond structure due to its tendency to form

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In this -

Proteins are found to have two different types of secondary structures viz $α -$ helix and $β -$ pleated sheet structure. $α -$ helix structure of protein is stabilised by
(a) peptide bonds (b) van der Waals, forces
(c) hydrogen bonds (d) dipole-dipole interactions

Why does cis-polyisoprene posses elastic property?

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