Interpretation:
The given questions based upon the
Concept introduction: Isotactic polypropylene has highest melting point and crystallinity while atactic polypropylene has lowest crystallinity and melting point. The difference is due to arrangement of substituents in the respective
(a)
To determine:
The hybridization of orbitals at each carbon atom in polyethylene and the angles between the bonds.
(b)
To determine:
The structure of polypropylene in which the methyl groups lie on the same side of the plane of paper; one in which methyl groups lie on alternating sides of plane; the structure in which methyl groups are randomly distributed on the either side; the form that will have highest crystallinity and melting point; and which has the lowest crystallinity and melting point and explanation in terms of intermolecular interactions and molecular shapes.
(i)
To determine:
The structure of polypropylene in which the methyl groups lie on the same side of the plane of paper.
(ii)
To determine:
The structure of polypropylene in which the methyl groups lie on alternating sides of plane.
(iii)
To determine:
The structure in which methyl groups are randomly distributed on the either side; the form that will have highest crystallinity and melting point; and which has the lowest crystallinity and melting point and explanation in terms of intermolecular interactions and molecular shapes.
(c)
To determine:
An explanation for the difference between polypropylene and polyester or cotton in terms of intermolecular interactions with water.
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