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Isotactic polypropylene polymer is one, in which:

1. all methyl groups are on one side of the extended chain. It is a highly crystalline, has high melting point and forms strong fibres
2. the methyl groups present alternates regularly from one side to the other
3. the methyl groups are distributed at random. It is a soft, elastic, and rubbery material
4. None of these

Correct answer: all methyl groups are on one side of the extended chain. It is a highly crystalline, has high melting point and forms strong fibres

Solution

Isotactic polypropylene has all the methyl groups oriented on the same side of the polymer chain, giving a very regular structure. This regularity lets chains pack tightly, so it is highly crystalline with a higher melting point and stronger fibers.

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