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The conversion of pi-bond to sigma bond during the chain propagation releases the energy of _________ K.cal/mole.

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The conversion of pi-bond to sigma bond during the chain propagation releases the energy of _________ K.cal/mole.

(a) 10

(b) 30

(c) 40

(d) 20
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Right answer is (d) 20

To explain I would say: The conversion of the pi-bond into the sigma bond during the chain polymerisation releases the energy of the 20K.cal/mole. An initiator is needed to start the polymerisation reaction.
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