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Which of the following reactions has Zer...

Which of the following reactions has Zero activation energy?

A

`CH_(4)+overset(.)(C)lrarroverset(.)(C)H_(3)+HCl`

B

`Cl_(2)rarr2Cl`

C

`overset(.)(C)H_(3)+overset(.)(C)H_(3)rarrCH_(3)+CH_(3)`

D

`overset(.)(C)H_(3)+Cl-ClrarrCH_(3)+Cl+overset(.)(C)l`

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