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Question

Direct Fluorination of methane is a laboratory is violently explosive. This is because the chain - initiation and chain-propagation steps are highly exothermic.


A

True

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B

False

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Solution

The correct option is B

False


The overall heat of reaction in the chain propagation step is highly exothermic.

But, the chain initiation step for all of F2, Cl2, Br2 and l2 are endothermic

F22F H=+159kJ.mol1

Cl22Cl H=+243kJ.mol1

Br22Br H=+193kJ.mol1

I22I H=+151kJ.mol1


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