A) Without proper control, atactic polypropylene is produced
B) During polymerization, a secondary free radical is produced in every step
C) Use of Ziegler-Natta catalyst results in isotactic polypropylene
D) During polymerization, a linear, unbranched, crystalline polymer is usually obtained
Correct Answer: D
Solution :
[d] Chain branching always takes place when an alkene undergoes free radical polymerization. This is due to the abstraction of some H-radicals form the growing polymer chain.
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