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Based on the arrangement of branching of...

Based on the arrangement of branching of `[(R)-(Ph),` in case of styron of `(CH_(3))`, in case of polypropene `]` groups relative to long`-` chain backbone of the polymer, how many types of stereoisomers are possible for styron or polypropene ?

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Three classes of stereoisomers are possible.
`i.` Isotactic, when `(CH_(3)-)` and `(R-)` groups are on the same side. It is highly crystalline, has high melting point, and forms strong fibres.

`ii.` Syndiotactic, when `(CH_(3)-)` and `(R-)` groups are on alternate sides. Its properties are intermediate of isotactic and atactic.

`iii.` Atactic, when `(CH_(3)-)` and `(R-)` groups are randomly arranged `:`

It is a soft, elastic , and rubbery material.
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