Free radicals can be produced by: use of high temperatures. irradiation with lig

Question

Free radicals can be produced by:

   use of high temperatures.

irradiation with light.

reaction of a molecule with another free radical.

both use of high temperatures and irradiation with light

  use of high temperatures, irradiation with light and reaction of a molecule with another free radical

(I put irradiation with light, and it was wrong. Can you please explain the answer? I'm not sure if both heat and irradiation are necessary to get to the formation of free radicals. Thanks)

   use of high temperatures.

Explanation / Answer

For formation of free radical we need high energy, which can be obtained by

a) high temperature

b) Irradiation with light

Also free radical can be obtained by reaction with another free radical (as observed in chain reactions)

So answer is use of high temperatures, irradiation with light and reaction of a molecule with another free radical

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