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Which of the following reactions has zer...

Which of the following reactions has zero activation energy ?

A

`CH_4+Cl rarr CH_3 +HCl`

B

`Cl-Cl rarr overset (hnu)rarr 2Cl`

C

`CH_3 + CH_3 rarr CH_3-CH_3`

D

`CH_3+Cl-Cl rarr CH_3-Cl +Cl`

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