The polymerization of propene to polypropene is represented by the reaction where $n$ has a large value. Given that average enthalpies of bond dissociation for $C = C$ and C - C at 298 K are 550 and $300 kJ / mol$ respectively. Regarding this reaction which of the following observation(s) is/are TRUE?

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One C = C is broken And two C-C are formed during polymerization of propylene So Δ H permol ​ = Δ H C = C ​ − 2Δ H C − C ​ = 550 − 2 ( 300 ) = 550 − 600 = − 50 kJ / mol This is an example of free radical chain polymerization.

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